That's hard for me...I like every PKMNs, but with my least favorite starters, that would be Gen 5, Unova. I mean, I've had an Tepig in Black and White, but in the E4 he was...not so good...never used snivy but my friend says that he tested Snivy, and he said her strenght sucks. I don't really know how Snivy is, but I will believe in my friend right now. Now Oshawott was the only one I liked, but I'm not a fan of water types? So in my opinion, my least favorite are...from Sinnoh! No, I'm kidding, Unova.