Ban king's rock from PvP
There's no need to explain why, it's frustrating to play a PvP, be about to win, you still got a counter vs Cloyster, and then, from nowhere, when cloyster just sets up Shell smash, tada, you get flinched!
It's literally one of the most unhealthy PvP items. For those who say that "King's rock is ok 'cause paraflinch exist eksdee", paraflinch can be stopped by lots of things like natural cure users, electric types, or heal bell cleric users, while king's rock cloyster is just a spammy
So your argument is "it's unhealthy 'cause the amout of time wasted".
The question is what you take as unhealthy on PvP, i'll list you some reasons why stall ain't unhealthy:
1. Stall is a way to play, you can hate it or like it, but it's a teambuilding strategy.
2. There's no way to avoid walls inside a metage, it's like so dumb to ask a wall limit, how you ensure a mon is a wall, because of their usage? Excuse me sir, there's also Pokemons which are sweepers