Piffle. Just use Renzokuken with the Lionheart and 255 strength. You'll get a bunch of dead Tonberry's really quickly. They can't survive more than two when I do this, usually they won't even survive one. Also, if you have fast characters, wait for the Tonberry to take two steps before unleashing everything at him. If you can kill him before he gets to you everything will be fine. Once he's taken two steps towards you, he'll stop using Everyone's Grudge. Renzokuken away!