Mudkip as my starter
Kanto
Charizard, Raichu, Sandslash, Arcanine, Dewgong, Ditto, Squirtle
Johto
Typhlosion, Sentret, Sudowoodo, Dunsparce, Skiploom, Sunflora, Quagsire, Wobbuffet, Shuckle, Umbreon (Suicune if legendaries are allowed)
Hoenn
Swampert, Mightyena, Zigzagoon, Lotad, Manetric, Corphish, Walrein, Cradily
Sinnoh
Torterra, Luxray, Bastiodon, Floatzel, Gastrodon, Lucario, Tangrowth, Leafeon, Mamoswine, Empoleon
Unova
Samurott, Stoutland, Simisage, Excadrill, Krookodile, Maractus, Golurk, Garbodor, Chandelure, Bisharp
Kalos
Delphox, Greninja, Talonflame, Pangoro, Clawitzer, Heliolisk, Sylveon, Goodra, Avalugg, Gourgeist
Alola
Decidueye, Incineroar, Togedemaru, Lycanroc (Dusk Forme), Shiinotic, Salandit, Pyukumuku, Bewear, Pallossand, Kommo-o (Solgaleo or Stakataka)
Galar
Cramorant, Snom, Thwackey, Inteleon, Corviknight, Pincurchin, Drednaw, Boltund, Perrserker, Dragapult