Temper, temper, the hell with controlling his temper, he's furious. How dare she taunt him. How dare her Pokemon make a mockery of his. Doesn't this lowlife grunt get it? He's Dio, he's going to stand at the top of everything and look down on everyone else and things like this cannot and will not be allowed to happen.

“Noivern, shred that rat to pieces! Razor Wind!”

...first of all, it doesn't work that way, but you know, he's mad. Second of all, it's going to take a turn to prepare. So he's going for complete overkill here, it's just going to take a little while to get there.