How hard is getting rocks on the field and then proceed to force switches?
Is Unaware Quagsire so easy to kill?
Different sets require different counters of course. And I know the situation where you expect one set just to be surprised by another, but set up sweepers are still easy to wall with strong walls and even easier to wall with Quagy. And even if Cress predicts the Taunt, what the heck is it going to do with 75 Sp Atk? Quag walls it for days,
any good attacker can overpower it with a STAB SE attack. Yanmega, on the other hand, can be outsped by both Thyplosion and Entei and be walled by Moltres. Explaining this is kind of redundant, but alas, Thyplosion can revenge it (or severly dent the switch in), Entei can do the same and Moltres can outstall it thanks to a 4x resistance to Bug. Where is your brokenness now? Cress can be made useless and walled, Yanmega can only switch in once before fainting with rocks on the field if it takes some prior damage, so I don't see your points.