I’ve found 5 I think, shiny geodude in pearl, after that I went back to emerald and found a poochyena, spinarak in Crystal after that, clauncher from chain fishing in X(for HOURS), and pelipper in omega ruby. These are in order of found dates, I like to jump between generations ^>^

Good, if you win the first battle in oaks lab, and the one left of viridian city he gets jolteon. Flareon if you lose one of them, and vaporeon if you lose both. Easy way to set difficulty but in the end it doesn’t matter much.