It IS, but Espeon doesn't hit hard enough nor is it bulky enough to meri usage over other Magic Bouncers.

Mega Sableye is super bulky, has alot of good resistances, can heal itself and has status options like Will O Wisp.

Mega Diancie hits like truck and is hard to switch in against.

And trade away this Kadabra I have that has a modest nature, perfect IVs in everything but HP, AND its hidden ability?! Are you nuts?!
I have an adamant Galvanize Graveler with near perfect IVs, too! I'm saving these for when I give my little sister Sun for her birthday. I'm not taking aaaaany bloody chances of someone running off with these guys! >:(