Heh, well, I've been here long enough to pick up a few tricks. Even wrote a guide a while back.
Anyway, let's see... Electric types are weak to ground, so you'll definitely want something to cover its weaknesses. Water and grass are your best bets, but ice works if you're willing to deal with added weaknesses. As far as water types go, Swampert's a good pick. Bulky, and it's only got one weakness, but there's a lot of other Pokémon to choose from.
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Anyway, let's see... Electric types are weak to ground, so you'll definitely want something to cover its weaknesses. Water and grass are your best bets, but ice works if you're willing to deal with added weaknesses. As far as water types go, Swampert's a good pick. Bulky, and it's only got one weakness, but there's a lot of other Pokémon to choose from.