>>26824933High ladder player here,
the solution is banning Chansey and Blissey.
The argument to keep them has been that they're relatively passive and are setup fodder, susceptible to Knock Off and physical moves, and are walled by Ghosts.
The problem with them though is that they wall any mon that targets Special Defense, and Chansey especially takes a good deal of physical hits. Chansey walls half the game, and can't even be broken by Special Fighting moves, whereas Skarm can be broken by Physical Fire moves.
I'd rather stall players substitute them for Audino, which doesn't take like 10% from a Raikou's Thunderbolt like they do. With Special Attackers able to take on stall, the playstyle would be better held in check.
Mega Sableye is far from a problem in comparison.