Well, you can't lower any stat to zero for any Pokemon. And 200 is really low for Haxorus. But your Special Attack stat will not affect your Pokemon if you have all Physical attacks, meaning you shouldn''t put any EVs in that stat, and it would be safe to give it a Special Attack hindering nature. Same with a Pokemon using all Special moves, you don't need to put in any EVs in Attack. In fact, if you have no physical moves, then you'll want your Attack as low as possible to reduce the damage taken by confusion. I'm not quite sure if this answers your question, as it was worded strangely.