What episode is it when ash falls in love Pokemon?

There is no episode where Ash falls in love with a Pokémon. Ash has always had a strong bond with his Pokémon and treats them like family, but there's no indication that he has romantic feelings for any of them.

Perhaps you're thinking of a specific moment or scene that gave you that impression? If you can provide more context, I might be able to help you identify what you're thinking of.