What episode does Amy kiss Sonic on the classic TV show X?

There is no classic TV show called "X" with characters named Amy and Sonic who kiss. It's possible you're thinking of a different show or have the names mixed up.

Perhaps you're thinking of Sonic the Hedgehog, which is a popular video game and cartoon franchise. In the Sonic the Hedgehog cartoon series, Amy has a crush on Sonic, but they don't kiss in any of the episodes.

Could you please provide more details about the show you're thinking of?