Is Pikachu's gender ever confirmed?

Ash's Pikachu is female because in one episode of Pokemon Black and White a female Pokemon used attract on Pikachu, but it doesn't work.

In the game, when Pokemon A uses the move Attract on Pokemon B, if Pokemon B is the opposite gender of Pokemon A, Pokemon B gains the status effect Infatuate, which causes their attacks to miss 50% of the time until the status effect is removed (the simplest method being to simply switch Pokemon B with another Pokemon from the trainer's roster).

The only qualifier for Attract to work or fail is the gender of the Pokemon the attack is used on. Both Pokemon do not need to be the same species.

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