Espeon is bad. If you're running a team with Chansey you're probably running stall and should just go with Mega Sableye.
I was kidding, and you have to mega evolve sableye and absol before switching it back in so it can't have as much fun switching into rocks unless it gone in and out, and rocks usually start up early. There is also Xatu, but its one of my least favourite mons to use competitively and just generally.