I'm very late for the discussion, but just want to add this: The strongest right-off-the-bat-move in Pokémon as of today is Max Ark. Ursaring@Choice Band switching in on Toxic Spikes, using Metronome and getting Explosion. Though, it's extremely unreliable and has no super-effective coverage. Still, it should leave a dent in anything not named Aggron or Bastiodon. Or, you know, Ghosts. Concerning rodents: Those are there for marketing reasons. Their entire purpose is to be cute and Pikachu-like. GameFreak did one grave error with Pikachu, and that was letting it evolve into something not-so-cute (I beg to disagree, but the Market supposedly doesn't). The standard electric rodent is a homage to/meant to cash in on the success that was Pikachu, and is very popular with little girls playing the games. They won't ever give it a badass evolution, nor will they ever evolve older ones. Expect to see one in the Anime,though.