What pokemon should be in a higher tier then it is in currently

[Curtistharder]

So for this thread i thought I would ask the question what pokemon should be in a higher tier then it is currently in, and why. My choice is Glyscor. Glyscore is currently OU but I believe it should be Ubers. My main problem with it is it doesn't die. Preaty much if you don't have an Ice type or if you don't burn it ASAP your team is screwed. With Poison Heal it can gain more HP then Leftovers. Not only does it get more HP then it does with LeftOvers it has its own form of sustain with roost. So I beileave that Glyscore should be UBERS not OU.