Just kidding, the only move I dislike is Draining Kiss. It's disgusting and I think Syvleon frenching a Grimer and taking all of it's slop and energy is quite frankly revolting. xD
You don't know how bad I wanted to breed that move on a Nidoran Female. Or any Kiss for that matter. They bloody learn Captivate, why the heck not?
Best for Poison? I can't say, but I feel like Speed is good for anyone, and if they don't have that, then Defense and/or HP to at least make the opponent feel like they have to slog through the fight against your Pokemon.
Oh, and speaking of Poke Bank and GTS, I managed to get myself Chikorita and it snowballed from there, with all starters now in possession, Pokemon I didn't want (to go out of my way to evolve) for Pokedex purposes (that's like, almost all of Generation IV and V), and some missing Gen I-III favorites. Porygon is back again!
Overall, GTS is pretty handy to cheap your way through the Pokedex if you breed a lot of starters. "Hey, you guys like Totodile. I don't like... Electabuzz's evo. Give me that so I don't have to waste my time and you can have an awesome giant lizard in the future in exchange!"