Gen I:
Venusaur, Charizard, Blastoise, Machamp, Gengar, Meowth, Alakazam, Mewtwo.
Gen II:
Feraligatr, Typhosion, Scizor, Heracross, Granbull, Ampharos, Tyranitar, Entei.
Gen III:
Sceptile, Blaziken, Swampert, Gardevoir, Flygon, Metagross, Aggron, Deoxys.
Gen IV:
Empoleon, Infernape, Lucario, Garchomp, Weavile, Toxicroak, Roserade, Darkrai.
Gen V:
Oshawott, Zoroark, Darmanitan, Golurk, Hydreigon, Haxorus, Meloetta, Genesect.
Gen VI:
Greninja, Braixen, Hawlucha, Noivern, Florges, Pangoro, Aegislash, Goodra,
Gen VII:
Incineroar, Decidueye, Bewear, Salazzle, Golisopod, Mimikyu, Tapu Koko, Pheromosa.
Gen VIII: Corviknight, Dreadnaw? Obstagoon?, Sirfetch’d?,
Extended:
Pikachu and Eevee.
Other fighters I’m considering/potential DLC:
Snorlax, Hitmonlee, Dragonite, Sandslash, Rhyhorn, Nidoking,
Azumarill, Blissey, Quagsire, Suicine, Raikou,
Mawile, Sableye, Cacturne, Absol, Breloom,
Lopunny, Gallade, Rhyperior, Luxray, Abomasnow, Electivire,
Emboar, Scrafty, Bisharp, Mienshao, Krookodile, Archeops, Excadrill
Chesnaught, Heliolisk, Hoopa,
Primarina, Zeraora, Alolan Marowak, Marshadow, Poipole,
Melmetal