Quoted By:
I have a weird question: what should a wall do, when it's not simply tanking hits? Note that I'm *not* asking what Pokemon make good walls. For example, Miltank is a wall, but in addition to switching in to attacks that are super-effective on its allies, it acts as a cleric and can attempt to paralyze opponents. Sableye stops setup, Tyranitar sets up weather, etc.
What are the most important things a wall can do besides sit there and be tough (and don't say sustain via Recover/etc, that's part of being tough)