Legends: Arceus plays nothing like a traditional Pokemon game. No abilities, no held items, and the turn system uses Agile Style (move first, lower power) and Strong Style (higher power, act later). Hisuian forms give familiar Pokemon new typings. Ursaluna at 140 Attack and Hisuian Zoroark (Normal/Ghost with three immunities) are highlights. Alpha Pokemon roam the overworld at boosted levels.
Pikachu
Raichu
Clefairy
Clefable
Vulpix
Ninetales
Zubat
Golbat
Paras
Parasect
Psyduck
Golduck
Growlithe
Arcanine
Abra
Kadabra
Alakazam
Machop
Machoke
Machamp
Tentacool
Tentacruel
Geodude
Graveler
Golem
Ponyta
Rapidash
Magnemite
Magneton
Gastly
Haunter
Gengar
Onix
Voltorb
Electrode
Lickitung
Rhyhorn
Rhydon
Chansey
Tangela
Mr. Mime
Scyther
Electabuzz
Magmar
Magikarp
Gyarados
Eevee
Vaporeon
242. That's a curated roster of Pokemon from various generations, plus new Hisuian forms and evolutions. It's not a national dex game. The focus is on catching and researching Pokemon in the wild.
Open-world action RPG set in ancient Sinnoh (called Hisui). You catch Pokemon by throwing Poke Balls at them in the overworld without battling. No abilities, no held items. Battles use Agile Style (move first, less power) and Strong Style (more power, act later) instead of traditional turns. Alpha Pokemon roam as mini-bosses.
Larger, more aggressive Pokemon that roam the overworld. They have red eyes, higher levels than surrounding Pokemon, and guaranteed perfect effort levels (the Legends: Arceus equivalent of EVs). Some Alphas are fixed spawns you can farm. They're the main source of high-stat Pokemon for your team.
Regional variants exclusive to the Hisui region. Hisuian Zoroark (Normal/Ghost) gets three immunities. Hisuian Typhlosion is Fire/Ghost. Hisuian Samurott is Water/Dark. Hisuian Lilligant (Grass/Fighting) and Hisuian Goodra (Steel/Dragon) are new typings. Some Hisuian forms also have new evolutions not found in other games.
Gen 8 by release timing, though it plays nothing like a Gen 8 game. Switch, January 2022. Game Freak built it as a prequel to Diamond and Pearl set in ancient Sinnoh (Hisui). Action RPG mechanics replaced the traditional turn-based formula.
- Gen IY
Yellow151 Pokemon - Gen IRB

Red & Blue151 Pokemon - Gen IIGS

Gold & Silver251 Pokemon - Gen IIC
Crystal251 Pokemon - Gen IIIRS

Ruby & Sapphire386 Pokemon - Gen IIIFRLG

FireRed & LeafGreen386 Pokemon - Gen IIIE
Emerald386 Pokemon - Gen IVPt
Platinum493 Pokemon - Gen IVHGSS

HeartGold & SoulSilver493 Pokemon - Gen IVDP

Diamond & Pearl493 Pokemon - Gen VBW

Black & White649 Pokemon - Gen VB2W2

Black 2 & White 2649 Pokemon - Gen VIXY

X & Y721 Pokemon - Gen VIORAS

Omega Ruby & Alpha Sapphire721 Pokemon - Gen VIIUSUM

Ultra Sun & Ultra Moon807 Pokemon - Gen VIISM

Sun & Moon802 Pokemon - Gen VIILGPE

Let's Go Pikachu & Eevee153 Pokemon - Gen VIIISwSh

Sword & Shield664 Pokemon - Gen VIIIPLA
Legends: Arceus242 Pokemon - Gen VIIIBDSP

Brilliant Diamond & Shining Pearl493 Pokemon - Gen IXSV

Scarlet & Violet733 Pokemon - Gen IXLZA
Legends: Z-A364 Pokemon - Gen XWW

Winds & Waves51 Pokemon