Squirtle, Psyduck, Poliwag, Slowpoke, Seel, Horsea, Lapras, Omanyte, Kabuto, Dratini, Totodile, Marill (of course), Wooper, Corsola, Remoraid, Delibird, Mantine, Mudkip, Lotad, Wingull, Surskit, Corphish, Feebas, Spheal, Clamperl, Relicanth, Pikachu, Clefairy, Jigglypuff, Chansey, Togetic, Hoppip, Snubbul, Shroomish, Skitty, Mawile, Plusle, Minun, Roselia, Castform, Snorunt and their evolutions.
I got the info here.