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I forget what the argument was. I think it had something to do with having the female role for some dance things. I think he even wore a cheerleader's outfit once in AG before he took on a more male Japanese outfit. Anyway, the matter would be inconclusive at least up until DP, and gender differences came into play. The thing is, though, for some pokemon coming into DP from AG, they kept their normal appearance despite any gender differences, so the matter could still be in doubt. CONFIRMED by being affected by a female pokemon's Attract.
Otherwise, I don't know, Pika acted in a typical male manner most of the time.
