Scraggy is easily my first choice, my favourite Pokemon of BW after Snivy. His trouble making ways remind me a little of Ash's Corphish in AG, who I also loved. I worry that he won't prosper under this current incarnation of Ash, who seems to be having trouble training any of his Pokemon, let alone a temperamental baby, but we'll have to wait and see.
Second choice is much more difficult, but I guess I'll have to go with Palpitoad. I haven't seen much of him in action yet, but I like him much more than the others. I hope we get to see him interact with Cilan's Stunfisk; I see them as the gangsters of the group. Plus, since none of the remaining gym leaders use Grass-types, the writers won't be able to troll us and make Ash look like an idiot for using Palpitoad against them. (If he uses Swadloon against Skyla, I swear I'll quit watching)