Battle Cats Facts:
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When they announced Uber Rares will have true form and you need to collect Catfruit in order to unlock it, in BCJP, it's called matatabi = actinidia polygama. That was the first time i've heard of this flower, then i googled it... Actinidia makes Cats go insane (if you've watched enough hentai, you will know what happen next). I think that's why they renamed it to "Catfruit".
In a nut shell, true form Cat Capsule Cats = your Cats on drug (they said Catfruit helps those Cats realize their true potential)