It's true, but you'll only get to use that probably once. You can certainly get a free switch in with Xzard just as Yzard can if you predict a ground move. However, if you try and predict that an enemy will not use a rock move (Or any SE move, really) while you are out and take that chance to DD or what have you, you are more than likely going to die. Really the only benefit of an immunity id switching in to a predicted immunity for a free switch in. As I said, Xzard can do that once, but trying to do it again is a waste of potential or it could flat out kill you. Yzard on the other hand can do it many times without wasting potential or puttting itself at increased risk (However, the risk is already high).I was merely trying to point out that while Yzard may have better defensive typing, but Xzard can use that same typing to benefit himself before Mega evolving.
Anyway I might come across as an Xzard fanboy atm but I'm not. To be honest I think both Mzards are really good and like I stated in my earlier post shouldn't be compared as they serve different roles.
No not really, you make a very valid point that Xzard does get that free switch in, which is very nice for it. Pointing out things that are valid doesn't make you a fanboy. It's when you ignore the disadvantages a pokemon has and boast it's strengths that gives off that vibe (Or when you boast the weaknesses and downplay the strengths of it's competition).