I've made it to level 81 with Metagross and it hasn't learned anything new so I'm going to assume it's level up moves haven't changed. From the TMs I have Metagross can use the following:
TM01 - Hone Claws
TM06 - Toxic
TM10 - Hidden Power
TM11 - Sunny Day
TM15 - Hyper Beam
TM16 - Light Screen...