With Clefables spiking in popularity I'm loving Flamethrower/Poltergeist Chandelure. Anti-heal is perfect on him and it really punishes the melee mons who love having a Clefable like Buzzwole, Trevenant, & Metagross. I know you said Metagross will destory Chandelure but h really doesn't. Poltergeist slows him down enough that you can usually kite away from him, and usually Metagross is too busy dealing with your front line to focus on getting to you in the backline.
His only trouble is being outranged by other mages. Given that flamethrower has an effective radius, the constant need to maintain a certain distance can get predictable which can be exploited by good speedsters to work around poltergeist.
Can't wait to master Chandy. Been the most fun I've had w the game ever. Flamethrower is wild and the passive and all the slowing and burning is so strong.