Ah, I see. And well, I've noticed many of my Pokemon do not enjoy Rawst berries. Far too bitter for them, so I've heard. My Turtwig enjoys chewing on things he really shouldn't - no real reason for it, just idle chewing - and a while back, to try and curb this habit as I was really getting tired of replacing my shoes, I smeared a bit of juice from a Rawst berry onto them. One bite, and he never went near my shoes again after that.

I suppose that would work just as well with other berries, provided the Pokemon really does not enjoy the taste.