Um, yes. They could. And before either of you ask: If you're expecting me to have some sort of explanation of the biology behind that, don't get your hopes up. Even the natives of that universe didn't seem to have the slightest clue, beyond the vague assertion that Pokemon don't copulate to reproduce the same way that you humans do.

[There's a bit of a shudder in her voice at that last bit. Bbbbuh. Pregnancy. Blech.]