I'll probably check the fishing tables for Gen 2 and see what you can hook up
It's supposed to only be Magikarp and Gyarados in the lake of rage, but I'll say that other stuff moved in since the Gyarados left
But I'm thinking things like Krabby, Poliwhirl, Seadra, Seaking, Quilfish, maybe a couple more
They'll each get a scene where the MC uses either their mouth or their butt before throwing them back into the lake