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For RS, it depends on which game you have. I think Mudkip is the best, but since I have sapphire, I usually choose Torchic, because I'll bet getting kyogre, and I would rather have Kyogre that Swampert in my party.
well TORCHIC is probably better
but I like Treecko 'cuz it's single type so it's weaknesses are limited
it really just depends on what you like and I like Treecko