If you can't visualize it, download the file from here

I've made one before  but this one has bigger individual artworks, and has a background.

Other compilations I've made:
Kanto Pokédex
HG/SS Johto Pokédex
OR/AS Hoenn Pokédex
Platinum Sinnoh Pokédex
B2/W2 Unova Pokédex
Kalos Pokédex (3 in 1)
Alola Pokédex

Only Gen II
Only Gen III
Only Gen IV
Only Gen V
Only Gen VI
Only Gen VII

© 2019 Pokémon

© 1995-2019 Nintendo / Creatures Inc. / GAME FREAK Inc.

No copyright infringement intended. Pokémon, Pokémon character names are trademarks of Nintendo.
This is just for the Pokémon lovers and Sugimori's fans (now also Yusuke Ohmura)

#001 Bulbasaur
#002 Ivysaur
#003 Venusaur
Mega Venusaur
#004 Charmander
#005 Charmeleon
#006 Charizard
Mega Charizard X
Mega Charizard Y
#007 Squirtle
#008 Wartortle
#009 Blastoise
Mega Blastoise
#010 Caterpie
#011 Metapod
#012 Butterfree
#013 Weedle
#014 Kakuna
#015 Beedrill
Mega Beedrill
#016 Pidgey
#017 Pidgeotto
#018 Pidgeot
Mega Pidgeot
#019 Rattata
#019 Alolan Rattata
#020 Raticate
#020 Alolan Raticate
#021 Spearow
#022 Fearow
#023 Ekans
#024 Arbok
#025 Pikachu
#026 Raichu
#026 Alolan Raichu
#027 Sandshrew
#027 Alolan Sandshrew
#028 Sandslash
#028 Alolan Sandslash
#029 Nidoran♀
#030 Nidorina
#031 Nidoqueen
#032 Nidoran♂
#033 Nidorino
#034 Nidoking
#035 Clefairy
#036 Clefable
#037 Vulpix
#037 Alolan Vulpix
#038 Ninetales
#038 Alolan Ninetales
#039 Jigglypuff
#040 Wigglytuff
#041 Zubat
#042 Golbat
#043 Oddish
#044 Gloom
#045 Vileplume
#046 Paras
#047 Parasect
#048 Venonat
#049 Venomoth
#050 Diglett
#050 Alolan Diglett
#051 Dugtrio
#051 Alolan Dugtrio
#052 Meowth
#052 Alolan Meowth
#053 Persian
#053 Alolan Persian
#054 Psyduck
#055 Golduck
#056 Mankey
#057 Primeape
#058 Growlithe
#059 Arcanine
#060 Poliwag
#061 Poliwhirl
#062 Poliwrath
#063 Abra
#064 Kadabra
#065 Alakazam
Mega Alakazam
#066 Machop
#067 Machoke
#068 Machamp
#069 Bellsprout
#070 Weepinbell
#071 Vcitreebel
#072 Tentacool
#073 Tentacruel
#074 Geodude
#074 Alolan Geodude
#075 Graveler
#075 Alolan Graveler
#076 Golem
#076 Alolan Golem
#077 Ponyta
#078 Rapidash
#079 Slowpoke
#080 Slowbro
Mega Slowbro
#081 Magnemite
#082 Magneton
#083 Farfetch'd
#084 Doduo
#085 Dodrio
#086 Seel
#087 Dewgong
#088 Grimer
#088 Alolan Grimer
#089 Muk
#089 Alolan Muk
#090 Shellder
#091 Cloyster
#092 Gastly
#093 Haunter
#094 Gengar
Mega Gengar
#095 Onix
#096 Drowzee
#097 Hypno
#098 Krabby
#099 Kingler
#100 Voltorb
#101 Electrode
#102 Exeggcute
#103 Exeggutor
#103 Alolan Exeggutor
#104 Cubone
#105 Marowak
#105 Alolan Marowak
#106 Hitmonlee
#107 Hitmonchan
#108 Lickitung
#109 Koffing
#110 Weezing
#111 Rhyhorn
#112 Rhydon
#113 Chansey
#114 Tangela
#115 Kangaskhan
Mega Kangaskhan
#116 Horsea
#117 Seadra
#118 Goldeen
#119 Seaking
#120 Staryu
#121 Starmie
#122 Mr. Mime
#123 Scyther
#124 Jynx
#125 Electabuzz
#126 Magmar
#127 Pinsir
Mega Pinsir
#128 Tauros
#129 Magikarp
#130 Gyarados
Mega Gyarados
#131 Lapras
#132 Ditto
#133 Eevee
#134 Vaporeon
#135 Jolteon
#136 Flareon
#137 Porygon
#138 Omanyte
#139 Omastar
#140 Kabuto
#141 Kabutops
#142 Aerodactyl
Mega Aerodactyl
#143 Snorlax
#144 Articuno
#145 Zapdos
#146 Moltres
#147 Dratini
#148 Dragonair
#149 Dragonite
#150 Mewtwo
Mega Mewtwo X
Mega Mewtwo Y
#151 Mew

#152 Chikorita
#153 Bayleef
#154 Meganium
#155 Cyndaquil
#156 Quilava
#157 Typhlosion
#158 Totodile
#159 Croconaw
#160 Feraligatr
#161 Sentret
#162 Furret
#163 Hoothoot
#164 Noctowl
#165 Ledyba
#166 Ledian
#167 Spinarak
#168 Ariados
#169 Crobat
#170 Chinchou
#171 Lanturn
#172 Pichu
#173 Cleffa
#174 Igglybuff
#175 Togepi
#176 Togetic
#177 Natu
#178 Xatu
#179 Mareep
#180 Flaaffy
#181 Ampharos
Mega Ampharos
#182 Bellossom
#183 Marill
#184 Azumarill
#185 Sudowoodo
#186 Politoed
#187 Hoppip
#188 Skiploom
#189 Jumpluff
#190 Aipom
#191 Sunkern
#192 Sunflora
#193 Yanma
#194 Wooper
#195 Quagsire
#196 Espeon
#197 Umbreon
#198 Murkrow
#199 Slowking
#200 Misdreavus
#201 Unown
#202 Wobbuffet
#203 Girafarig
#204 Pineco
#205 Forretress
#206 Dunsparce
#207 Gligar
#208 Steelix
Mega Steelix
#209 Snubbull
#210 Granbull
#211 Qwilfish
#212 Scizor
Mega Scizor
#213 Shuckle
#214 Heracross
Mega Heracross
#215 Sneasel
#216 Teddiursa
#217 Ursaring
#218 Slugma
#219 Magcargo
#220 Swinub
#221 Piloswine
#222 Corsola
#223 Remoraid
#224 Octillery
#225 Delibird
#226 Mantine
#227 Skarmory
#228 Houndour
#229 Houndoom
Mega Houndoom
#230 Kingdra
#231 Phanpy
#232 Donphan
#233 Porygon2
#234 Stantler
#235 Smeargle
#236 Tyrogue
#237 Hitmontop
#238 Smoochum
#239 Elekid
#240 Magby
#241 Miltank
#242 Blissey
#243 Raikou
#244 Entei
#245 Suicune
#246 Larvitar
#247 Pupitar
#248 Tyranitar
Mega Tyranitar
#249 Lugia
#250 Ho-Oh
#251 Celebi

#252 Treecko
#253 Grovyle
#254 Sceptile
Mega Sceptile
#255 Torchic
#256 Combusken
#257 Blaziken
Mega Blaziken
#258 Mudkip
#259 Marshtomp
#260 Swampert
Mega Swampert
#261 Poochyena
#262 Mightyena
#263 Zigzagoon
#264 Linoone
#265 Wurmple
#266 Silcoon
#267 Beautifly
#268 Cascoon
#269 Dustox
#270 Lotad
#271 Lombre
#272 Ludicolo
#273 Seedot
#274 Nuzleaf
#275 Shiftry
#276 Taillow
#277 Swellow
#278 Wingull
#279 Pelipper
#280 Ralts
#281 Kirlia
#282 Gardevoir
Mega Gardevoir
#283 Surskit
#284 Masquerain
#285 Shroomish
#286 Breloom
#287 Slakoth
#288 Vigoroth
#289 Slaking
#290 Nincada
#291 Ninjask
#292 Shedinja
#293 Whismur
#294 Loudred
#295 Exploud
#296 Makuhita
#297 Hariyama
#298 Azurill
#299 Nosepass
#300 Skitty
#301 Delcatty
#302 Sableye
Mega Sableye
#303 Mawile
Mega Mawile
#304 Aron
#305 Lairon
#306 Aggron
Mega Aggron
#307 Meditite
#308 Medicham
Mega Medicham
#309 Electrike
#310 Manectric
Mega Manectric
#311 Plusle
#312 Minun
#313 Volbeat
#314 Illumise
#315 Roselia
#316 Gulpin
#317 Swalot
#318 Carvanha
#319 Sharpedo
Mega Sharpedo
#320 Wailmer
#321 Wailord
#322 Numel
#323 Camerupt
Mega Camerupt
#324 Torkoal
#325 Spoink
#326 Grumpig
#327 Spinda
#328 Trapinch
#329 Vibrava
#330 Flygon
#331 Cacnea
#332 Cacturne
#333 Swablu
#334 Altaria
Mega Altaria
#335 Zangoose
#336 Seviper
#337 Lunatone
#338 Solrock
#339 Barboach
#340 Whiscash
#341 Corphish
#342 Crawdaunt
#343 Baltoy
#344 Claydol
#345 Lileep
#346 Cradily
#347 Anorith
#348 Armaldo
#349 Feebas
#350 Milotic
#351 Castform
#351 Castform Sunny Form
#351 Castform Rainy Form
#351 Castform Snowy Form
#352 Kecleon
#353 Shuppet
#354 Banette
Mega Banette
#355 Duskull
#356 Dusclops
#357 Tropius
#358 Chimecho
#359 Absol
Mega Absol
#360 Wynaut
#361 Snorunt
#362 Glalie
Mega Glalie
#363 Spheal
#364 Sealeo
#365 Walrein
#366 Clamperl
#367 Huntail
#368 Gorebyss
#369 Relicanth
#370 Luvdisc
#371 Bagon
#372 Shelgon
#373 Salamence
Mega Salamence
#374 Beldum
#375 Metang
#376 Metagross
Mega Metagross
#377 Regirock
#378 Regice
#379 Registeel
#380 Latias
Mega Latias
#381 Latios
Mega Latios
#382 Kyogre
Primal Kyogre
#383 Groudon
Primal Groudon
#384 Rayquaza
Mega Rayquaza
#385 Jirachi
#386 Deoxys Normal Forme
#386 Deoxys Attack Forme
#386 Deoxys Defense Forme
#386 Deoxys Speed Forme

#387 Turtwig
#388 Grotle
#389 Torterra
#390 Chimchar
#391 Monferno
#392 Infernape
#393 Piplup
#394 Prinplup
#395 Empoleon
#396 Starly
#397 Staravia
#398 Staraptor
#399 Bidoof
#400 Bibarel
#401 Kricketot
#402 Kricketune
#403 Shinx
#404 Luxio
#405 Luxray
#406 Budew
#407 Roserade
#408 Cranidos
#409 Rampardos
#410 Shieldon
#411 Bastiodon
#412 Burmy No Cloak
#412 Burmy Plant Cloak
#412 Burmy Sandy Cloak
#412 Burmy Trash Cloak
#413 Wormadam Plant Cloak
#413 Wormadam Sandy Cloak
#413 Wormadam Trash Cloak
#414 Mothim
#415 Combee
#416 Vespiquen
#417 Pachirisu
#418 Buizel
#419 Floatzel
#420 Cherubi
#421 Cherrim Overcast Form
#421 Cherrim Sunshine Form
#422 Shellos West Sea
#422 Shellos East Sea
#423 Gastrodon West Sea
#423 Gastrodon East Sea
#424 Ambipom
#425 Drifloon
#426 Drifblim
#427 Buneary
#428 Lopunny
Mega Lopunny
#429 Mismagius
#430 Honchkrow
#431 Glameow
#432 Prugly
#433 Chingling
#434 Stunky
#435 Skuntank
#436 Bronzor
#437 Bronzong
#438 Bonsly
#439 Mime Jr.
#440 Happiny
#441 Chatot
#442 Spiritomb
#443 Gible
#444 Gabite
#445 Garchomp
Mega Garchomp
#446 Munchlax
#447 Riolu
#448 Lucario
Mega Lucario
#449 Hippopotas
#450 Hippowdon
#451 Skorupi
#452 Drapion
#453 Croagunk
#454 Toxicroak
#455 Carnivine
#456 Finneon
#457 Lumineon
#458 Mantyke
#459 Snover
#460 Abomasnow
Mega Abomasnow
#461 Weavile
#462 Magnezone
#463 Lickilicky
#464 Rhyperior
#465 Tangrowth
#466 Electivire
#467 Magmortar
#468 Togekiss
#469 Yanmega
#470 Leafeon
#471 Glaceon
#472 Gliscor
#473 Mamoswine
#474 Porygon-Z
#475 Gallade
Mega Gallade
#476 Probopass
#477 Dusknoir
#478 Froslass
#479 Rotom
#479 Fan Rotom
#479 Frost Rotom
#479 Heat Rotom
#479 Mow Rotom
#479 Wash Rotom
#480 Uxie
#481 Mesprit
#482 Azelf
#483 Dialga
#484 Palkia
#485 Heatran
#486 Regigigas
#487 Giratina Altered Forme
#487 Giratina Origin Forme
#488 Cresselia
#489 Phione
#490 Manaphy
#491 Darkrai
#492 Shaymin Land Forme
#492 Shaymin Sky Forme
#493 Arceus

#494 Victini
#495 Snivy
#496 Servine
#497 Serperior
#498 Tepig
#499 Pignite
#500 Emboar
#501 Oshawott
#502 Dewott
#503 Samurott
#504 Patrat
#505 Watchog
#506 Lillipup
#507 Herdier
#508 Stoutland
#509 Purrloin
#510 Liepard
#511 Pansage
#512 Simisage
#513 Pansear
#514 Simisear
#515 Panpour
#516 Simipour
#517 Munna
#518 Musharna
#519 Pidove
#520 Tranquill
#521 Unfezant Male
#521 Unfezant Female
#522 Blitzle
#523 Zebstrika
#524 Roggenrola
#525 Boldore
#526 Gigalith
#527 Woobat
#528 Swoobat
#529 Drilbur
#530 Excadrill
#531 Audino
Mega Audino
#532 Timburr
#533 Gurdurr
#534 Conkeldurr
#535 Tympole
#536 Palpitoad
#537 Seismitoad
#538 Throh
#539 Sawk
#540 Sewaddle
#541 Swadloon
#542 Leavanny
#543 Venipede
#544 Whirlipede
#545 Scolipede
#546 Cottonee
#547 Whimsicott
#548 Petilil
#549 Lilligant
#550 Basculin Red Stripe Form
#550 Basculin Blue Stripe Form
#551 Sandile
#552 Krokorok
#553 Krookodile
#554 Darumaka
#555 Darmanitan Standard Mode
#555 Darmanitan Zen Mode
#556 Maractus
#557 Dwebble
#558 Crustle
#559 Scraggy
#560 Scrafty
#561 Sigilyph
#562 Yamask
#563 Cofagrigus
#564 Tirtouga
#565 Carracosta
#566 Archen
#567 Archeops
#568 Trubbish
#569 Garbodor
#570 Zorua
#571 Zoroark
#572 Minccino
#573 Cinccino
#574 Gothita
#575 Gothorita
#576 Gothitelle
#577 Solosis
#578 Duosion
#579 Reuniclus
#580 Ducklett
#581 Swanna
#582 Vanillite
#583 Vanillish
#584 Vanilluxe
#585 Deerling Spring Form
#585 Deerling Summer Form
#585 Deerling Autumn Form
#585 Deerling Winter Form
#586 Sawsbuck Spring Form
#586 Sawsbuck Summer Form
#586 Sawsbuck Autumn Form
#586 Sawsbuck Winter Form
#587 Emolga
#588 Karrablast
#589 Escavalier
#590 Foongus
#591 Amoonguss
#592 Frillish Male
#592 Frillish Female
#593 Jellicent Male
#593 Jellicent Female
#594 Alomomola
#595 Joltik
#596 Galvantula
#597 Ferroseed
#598 Ferrothorn
#599 Klink
#600 Klang
#601 Klinlkang
#602 Tynamo
#603 Eelektrik
#604 Eelektross
#605 Elgyem
#606 Beheeyem
#607 Litwick
#608 Lampent
#609 Chandelure
#610 Axew
#611 Fraxure
#612 Haxorus
#613 Cubchoo
#614 Beartic
#615 Cryogonal
#616 Shelmet
#617 Accelgor
#618 Stunfisk
#619 Mienfoo
#620 Mienshao
#621 Druddigon
#622 Golett
#623 Golurk
#624 Pawniard
#625 Bisharp
#626 Bouffalant
#627 Rufflet
#628 Braviary
#629 Vullaby
#630 Mandibuzz
#631 Heatmor
#632 Durant
#633 Deino
#634 Zweilous
#635 Hydreigon
#636 Larvesta
#637 Volcarona
#638 Cobalion
#639 Terrakion
#640 Virizion
#641 Tornadus Incarnate Forme
#641 Tornadus Therian Forme
#642 Thundurus Incarnate Forme
#642 Thundurus Therian Forme
#643 Reshiram
#644 Zekrom
#645 Landorus Incarnate Forme
#645 Landorus Therian Forme
#646 Kyurem
#646 Black Kyurem
#646 White Kyurem
#647 Keldeo Ordinary Form
#647 Keldeo Resolute Form
#648 Meloetta Aria Forme
#648 Meloetta Pirouette Forme
#649 Genesect

#650 Chespin
#651 Quilladin
#652 Chesnaught
#653 Fennekin
#654 Braixen
#655 Delphox
#656 Froakie
#657 Frogadier
#658 Greninja
#658 Ash Greninja (status unsure)
#659 Bunnelby
#660 Diggersby
#661 Fletchling
#662 Fletchinder
#663 Talonflame
#664 Scatterbug
#665 Spewpa
#666 Vivillon Meadow Pattern
#666 Vivillon Archipielago Pattern
#666 Vivillon Continental Pattern
#666 Vivillon Elegant Pattern
#666 Vivillon Garden Pattern
#666 Vivillon High Plains Pattern
#666 Vivillon Icy Snow Pattern
#666 Vivillon Jungle Pattern
#666 Vivillon Marine Pattern
#666 Vivillon Modern Pattern
#666 Vivillon Monsoon Pattern
#666 Vivillon Ocean Pattern
#666 Vivillon Polar Pattern
#666 Vivillon River Pattern
#666 Vivillon Sandstorm Pattern
#666 Vivillon Savanna Pattern
#666 Vivillon Sun Pattern
#666 Vivillon Tundra Pattern
#666 Vivillon Poké Ball Pattern
#666 Vivillon Fancy Pattern
#667 Litleo
#668 Pyroar Male
#668 Pyroar Female
#669 Flabébé Red Flower
#670 Floette Red Flower
#671 Florges Red Flower
#672 Skiddo
#673 Gogoat
#674 Pancham
#675 Pangoro
#676 Furfrou Untrimmed
#676 Furfrou Diamond Trim
#676 Furfrou Heart Trim
#676 Furfrou Star Trim
#677 Espurr
#678 Meowstic Male
#678 Meowstic Female
#679 Honedge
#680 Doublade
#681 Aegislash Blade Forme
#681 Aegislash Shield Forme
#682 Spritzee
#683 Aromatisse
#684 Swirlix
#685 Slurpuff
#686 Inkay
#687 Malamar
#688 Binacle
#689 Barbaracle
#690 Skrelp
#691 Dragalge
#692 Clauncher
#693 Clawitzer
#694 Helioptile
#695 Heliolisk
#696 Tyrunt
#697 Tyrantrum
#698 Amaura
#699 Aurorus
#700 Sylveon
#701 Hawlucha
#702 Dedenne
#703 Carbink
#704 Goomy
#705 Sligoo
#706 Goodra
#707 Klefki
#708 Phantump
#709 Trevenant
#710 Pumpkaboo
#711 Gourgeist
#712 Bergmite
#713 Avalugg
#714 Noibat
#715 Noivern
#716 Xerneas Active Mode
#717 Yveltal
#718 Zygarde 50%
#718 Zygarde Cell (status unsure)
#718 Zygarde Core (status unsure)
#718 Zygarde 10%
#718 Zygarde Complete
#719 Diancie
Mega Diancie
#720 Hoopa Confined
#720 Hoopa Unbound
#721 Volcanion

#722 Rowlet
#723 Dartrix
#724 Decidueye
#725 Litten
#726 Torracat
#727 Incineroar
#728 Popplio
#729 Brionne
#730 Primarina
#731 Pikipek
#732 Trumbeak
#733 Toucannon
#734 Yungoos
#735 Gumshoos
#736 Grubbin
#737 Charjabug
#738 Vikavolt
#739 Crabrawler
#740 Crabominable
#741 Oricorio Baile Style
#741 Oricorio Pa'u Style
#741 Oricorio Pom Pom Style
#741 Oricorio Sensu Style
#742 Cutiefly
#743 Ribombee
#744 Rockruff
#745 Lycanroc Midday Form
#745 Lycanroc Midnight Form
#745 Lycanroc Dusk Form
#746 Wishiwashi Solo Form
#746 Wishiwashi School Form
#747 Mareanie
#748 Toxapex
#749 Mudbray
#750 Mudsdale
#751 Dewpider
#752 Araquanid
#753 Fomantis
#754 Lurantis
#755 Morelull
#756 Shiinotic
#757 Salandit
#758 Salazzle
#759 Stufful
#760 Bewear
#761 Bounsweet
#762 Steenee
#763 Tsareena
#764 Comfey
#765 Oranguru
#766 Passimian
#767 Wimpod
#768 Golisopod
#769 Sandygast
#770 Palossand
#771 Pyukumuku
#772 Type: Null
#773 Silvally
#774 Minior Meteor Form
#774 Minior Red Core
#775 Komala
#776 Turtonator
#777 Togedemaru
#778 Mimikyu Disguised Form
#779 Bruxish
#780 Drampa
#781 Dhelmise
#782 Jangmo-o
#783 Hakamo-o
#784 Kommo-o
#785 Tapu Koko
#786 Tapu Lele
#787 Tapu Bulu
#788 Tapu Fini
#789 Cosmog
#790 Cosmoem
#791 Solgaleo
#792 Lunala
#793 Nihilego
#794 Buzzwole 
#795 Pheromosa 
#796 Xurkitree 
#797 Celesteela 
#798 Kartana 
#799 Guzzlord 
#800 Necrozma 
#800 Dusk Mane Necrozma 
#800 Dawn Wings Necrozma 
Ultra Necrozma 
#801 Magearna (pending to see if the alternate coloration will have official artwork too)
#802 Marshadow
#803 Poipole
#804 Naganadel 
#805 Stakataka 
#806 Blacephalon 
#807 Zeraora 
#??? Zamazenta

The following Pokémon don't have an official artwork:

• Cosplay Pikachu (without outfit)
  
• Spiky-eared Pichu
  
• Unown A, Unown B, Unown C, Unown D, Unown E, Unown G, Unown H, Unown I, Unown J, Unown K, Unown L, Unown M, Unown N, Unown O, Unown P, Unown Q, Unown R, Unown S, Unown T, Unown U, Unown V, Unown W, Unown X, Unown Y, Unown Z, Unown ?, Unown !
• Arceus Fire-Type, Arceus Water-Type, Arceus Electric-Type, Arceus Grass-Type, Arceus Ice-Type, Arceus Fighting-Type, Arceus Poison-Type, Arceus Ground-Type, Arceus Flying-Type, Arceus Psychic-Type, Arceus Bug-Type, Arceus Rock-Type, Arceus Ghost-Type, Arceus Dragon-Type, Arceus Dark-Type, Arceus Steel-Type, Arceus Fairy-Type
• Genesect Shock Drive, Genesect Burn Drive, Genesect Chill Drive, Genesect Douse Drive
• Flabébé Yellow Flower, Flabébé Orange Flower, Flabébé Blue Flower, Flabébé White Flower
• Floette Yellow Flower, Floette Orange Flower, Floette Blue Flower, Floette White Flower, Floette AZ
• Florges Yellow Flower, Florges Orange Flower, Florges Blue Flower, Florges White Flower
• Furfrou Debutante Trim, Furfrou Matron Trim, Furfrou Dandy Trim, Furfrou La Reine Trim, Furfrou Kabuki Trim, Furfrou Pharaoh Trim
• Xerneas Neutral Mode
• Minior Core Green, Minior Core Yellow, Minior Core Orange, Minior Core Blue, Minior Core Purple
• Mimikyu Busted Form
  
• Silvally Fire-Type, Silvally Water-Type, Silvally Electric-Type, Silvally Grass-Type, Silvally Ice-Type, Silvally Fighting-Type, Silvally Poison-Type, Silvally Ground-Type, Silvally Flying-Type, Silvally Psychic-Type, Silvally Bug-Type, Silvally Rock-Type, Silvally Ghost-Type, Silvally Dragon-Type, Silvally Dark-Type, Silvally Steel-Type, Silvally Fairy-Type
• Original Color Magearna
• Impidimp
• New Rotom Form(s) Rotomi? (seen in trailer of SwSh)
• Alcremie multiple flavors
  

There are some Pokémon that do have official artwork, but I decided not to include them:

• Pikachu Rock Star, Pikachu Belle, Pikachu Pop Star, Pikachu, Ph. D, Pikachu Libre: since they appear only in  OR/As, but they're included here.
  
• I wouldn't have included Cosplay Pikachu or Spiky-eared Pichu if they had artwork though.
  
• Pumkaboo Small Size, Pumkaboo Large Size, Pumpkaboo Super Size; Gourgeist Small Size, Gourgeist Large Size, Gourgeist Super Size: assuming the official artwork is the Average Size, they actually don't confirm it either. Official sources only change the size of the same artwork, the official website uses the exact same.
  
• Solgaleo Radiant Sun Phase and Lunala Full Moon Phase do have a Ken Sugimori artwork, but to me it's more of a conceptual art rather than the artwork of an actual form, like the others.

Unsure status:

• PokéDex Rotom: it had been included in older versions of this collage, but I decided to remove it once the leaks occurred, since it doesn't have a battle sprite as we all imagined it. It was included in the Gen VII collage.
• Ash Greninja: it'll surely be treated as the Mega Evolutions or Primal Reversions, so I do see it being present in future games, but time will tell. If it ends up being just a Sun/Moon exclusive, it'll be removed and it'll stay only in the Gen VII collage.
• Zygarde Cell and Zygarde Core: they don't have battle sprites either. If they disappear in future games/generations, they'll be removed from the big picture as well.
• Pikachu Original Cap, Hoenn Cap, Sinnoh Cap, Unova Cap, Kalos Cap, Alola Cap, I Choose You Cap: they are included only in the Gen VII collage.
• Mega Evolutions as they won't appear in every game starting with Gen VIII