I suppose there's a number of ways that could be used. The AI has a habit of periodically just hanging back and not doing anything, and you could easily charge an attack in that time. If it hits them, great! Cerebella's charge attack does a ton of damage to start with. But if it doesn't, you now have 5 stacks of enrage you might put into a Diamonds are Forever or a Diamond Drop or maybe just a Merry Go-Rilla or Battle Butt. She has a number of good moves that deal their damage in one lump that could benefit. Plus, I've been learning that Cerebella's pretty good at charging up an attack right after killing someone and punishing the next person to hop in the ring with an unblockable and unavoidable charge attack. It still doesn't sound like the best SA to me, but it has a bit more potential than it might seem at first.