Kanto
Pikachu
Caterpie line (Butterfree released)
Pidgeotto (evolved into Pidgeot)
Bulbasaur
Charmander line
Squirtle
Krabby line
Raticate (trades Butterfree for it then trades it back)
Primeape
Muk
Tauros group
Lapras (released)
Snorlax
Johto
Heracross
Chikorita (evolved into Bayleef)
Cyndaquil (evolved into Quilava in the Sinnoh anime)
Totodile
Noctowl (shiny)
Beedril (gives it away)
Seaking (released)
Phanpy line
Hoenn
Tailow line
Treecko line
Corphish
Torkoal
Snorunt line
Aipom
Sinnoh
Starly line
Turtwig line
Chimchar line
Buizel (Traded Aipom with Dawn)
Gligar line
Gible
Unova
Pidove line
Oshawott
Tepig (evolved into Pignite)
Snivy
Scraggy
Sewaddle line
Palpitoad
Roggenrola (evolved into Boldore)
Krokorok (evolved into Krookodile)
Kalos
Froakie line (Greninja released)
Fletchling line
Hawlucha
Goomy line
Noibat line
Alola
Rowlet
Rockruff line
Litten line
Buzzwhole (released)
Poipole line
Stakataka (released)
Meltan line
Pheromosa (released)
Galar
Dragonite
Gengar
Riolu line
Galarian Farfetch'd line
Dracovish
Personally I dropped the anime after Kalos so I had to research the rest of the series.
