I think it goes without saying that Pokémon fans tend to have one or a few favourites. Thus, I made this thread so we could all talk about our favourite(s) and explain why we like them.
My favourites tend to stem from the Water type, especially the starters. While I have Keldeo as my avatar, and he remains as one of my favourites, I have one other I would put above him.
Swampert. The things I like about Swampert the most would have to be his colour scheme (blue and orange just work so well together), his animal design and his typing. Sure, he's 4x weak to Grass, but I like being able to one-up Electric types.