Grating Spaces!

On their way to the Battle Pyramid, Ash & Co. stop in to Pewter Gym to see Brock's Family. When they get there Brock gets two suprises, his Onix has evolved into a Steelix and the gym has pretty much been vandalised on the inside due to lack of care for the gym. However when he's trying to fix it, Team Rocket come in disguise with strong Pokémon delivered by Delibird in order to try and capture the gym, Charizard & Aggron. Will Ash & Brock be able to defend the gym?