Kirishima doesn't need to Fly - he has an Onix that is able to elevate him right onto the awning or else launch him up there. And he's got the sort of training to land and leap on through into the control center even if he doesn't have his ability to armor himself anymore. Instead, Kirishima throws down a Pokeball like a bomb, the light giving way to a Noibat.

"Supersonic!" The redhead calls, and it's already understood that the Pokemon's attack is directed to whatever Pokemon are up on the awning. Kirishima himself, however, is going to try and bodily bulldoze Steven himself. As far as he's concerned, the Rocket is fair game for him.