THE FINAL BATTLE
Switch!
Bug hits for good neutral damage, Steel trumps Fairy. You'd be a fool not to.
Your turn is spent switching out Dragalge, bringing out Scizor to take whatever hit Gardevoir's set to dish out.
Turns out it's gonna be a huge hit. Your rival's Mega Bracelet lights up, and Gardevoir lights up with it. She's Mega Evolving. You briefly wonder if it might have been better to give a Mega Stone to Scizor instead of Lopunny, since you know Mega Scizor is a thing that exists. But nah, Lop's a BEAST when she Megas up, and Scizor doesn't even need it since he's a beast on his oh shit that's a Moonblast.
Fortunately, Scizor barely takes a scratch from the hit thanks to Steel's resistance to Fairy. He's raring to go, and now so are you.
Gardevoir's still at full health, so there's one big answer to her in Scizor's move pool. So obviously you use it.