Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Can't wait to see how Mega-Aggron does in UU. Was good last gen, (especially paired w/ things like florges, was usually at decent hp) but now that Xurkitree is a mon, idk if I'd run it over M-Steelix.