This was a tough choice, but I had to go with Samurott. It's a decent sweeper with a decent movepool, and has access to Swords Dance, which helps make up for its below-average attack stat. It may have low speed, but after a Swords Dance, it more than makes up for it in attack power. Also, Oshawott is going to be the starter I choose for White 2. So, Samurott it is!