Oh gosh I'd love to have a pachirisu and a shellos. Also piplup! OMG and Pichu! I've always wanted one, they were my favourite pokemon when I was little! It wouldn't bother me so much that shellos and piplup won't evolve because if they're just pets their stats don't really matter and I think they're cuter in their pre-evolved forms. Or you could just feed them rare candies all the time to level them up so they evolve. Or maybe recreational battles with friends. I mean it's not like you'd be an actual trainer collecting badges, something just for fun, and only if the pokemon agrees. Same goes for pichu when it comes to evolution but since it evolves with friendliness I'd have to give it an everstone ^.^ so cute.