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It's not if you could, but if you should.
Most of the time, you shouldn't.
Take, for example, in real life: dolphins.
Dolphins are the most intelligent animals on the planet and are probably more sentient than us, but do you see humans and dolphins fucking?
No. Why?
Because humans and dolphins can't talk.
Therefore, if you can't talk with a Pokemon, you shouldn't fuck it.
Which is why Pokemon that can communicate via telepathy and are very human-like are quite fuckable.