My baseless roster accounting for variety and roster limit:
Gen I: Charizard, Primeape, Machamp, Alakazam, Hitmonlee, Hitmonchan, Kabutops, Dragonite, Mewtwo
Gen II: Ampharos, Sudowoodo, Scizor, Heracross, Ursaring, Hitmontop, Blissey
Gen III: Sceptile, Blaziken, Swampert, Shiftry, Gardevoir, Medicham, Deoxys
Gen IV: Roserade, Ambipom, Lopunny, Garchomp, Lucario, Weavile, Regigigas
Gen V: Scrafty, Zoroark, Gothitelle, Ferrothorn, Bisharp, Meleotta, Genesect
Gen VI: Chesnaught, Delphox, Greninja, Florges, Aegislash, Hawlucha, Diancie
Unexpected additions: Pikachu (don't see Pikachu being the mascot of the game in addition to Pokemon Conquest or Rangers), Jigglypuff, Snorlax, Farfetch'd, Mr. Mime, Wobbuffet, Oshawatt