Earth Wolf-Howl
Nuzlocker
I've never raised Ratatta, Meowth, Spearow, Pikachu, Flareon, Dratini, or the fossils. I'll be using Spearow next playthrough instead of Pidgey though.
Too many to name. I'm apparently pretty picky . It's not like I don't catch Pokémon, I just don't use many of them.