I don't really get why Metagross is now in UU, but I've used this set on so many teams and time after time it's proven useful on my OU teams.
Metagross @ Leftovers
Ability: Clear Body
EVs: 36 hp / 204 atk / 36 def / 56 sp.def / 176 spe
Adamant Nature (+Atk, -Sp. Atk)
- Ice Punch
- Earthquake
- Agility
- Iron Head/Meteor Mash
First off, Metagross has some all around amazing base stats (135attack, 130 defense) with nice typing. Clear Body is nice for the annoying U-turn users spam switching into a Poke with Intimidate. The Steel/Psychic typing allows for Metagross to be immune to Toxic, toxic spikes, and anything poison of the like. The trick behind this Metagross is to switch in at a safe time, get an agility in, and then be able to do your own thing. After a +2 to speed, Metagross is able to easily take out threats such as Heatran with Earthquake. Surprisingly I have not seen a single other Metagross with Ice Punch yet. It has helped me with so many Dragonites, Garchomps, etc - I always OHKO them. Ice Punch is a vital move for counters. Finally, you have your choice of Iron Head or Meteor Mash. I have been using MM most of the time, but the attack boost seems to be rare (the whole point of me using the move) and the 85% accuracy is a little bit frustrating at times. I figured Iron Head can be a nice alternative with its 100 accuracy as well as 30% flinch, and still able to get STAB, so I have been running Iron Head with it recently.
Let me know what you guys think :-) I think Metagross is going to shoot right back into OU or Ubers once the new games come out and its mega form is released. Mega Metagross is going to be one of the next biggest threats.

Metagross @ Leftovers
Ability: Clear Body
EVs: 36 hp / 204 atk / 36 def / 56 sp.def / 176 spe
Adamant Nature (+Atk, -Sp. Atk)
- Ice Punch
- Earthquake
- Agility
- Iron Head/Meteor Mash
First off, Metagross has some all around amazing base stats (135attack, 130 defense) with nice typing. Clear Body is nice for the annoying U-turn users spam switching into a Poke with Intimidate. The Steel/Psychic typing allows for Metagross to be immune to Toxic, toxic spikes, and anything poison of the like. The trick behind this Metagross is to switch in at a safe time, get an agility in, and then be able to do your own thing. After a +2 to speed, Metagross is able to easily take out threats such as Heatran with Earthquake. Surprisingly I have not seen a single other Metagross with Ice Punch yet. It has helped me with so many Dragonites, Garchomps, etc - I always OHKO them. Ice Punch is a vital move for counters. Finally, you have your choice of Iron Head or Meteor Mash. I have been using MM most of the time, but the attack boost seems to be rare (the whole point of me using the move) and the 85% accuracy is a little bit frustrating at times. I figured Iron Head can be a nice alternative with its 100 accuracy as well as 30% flinch, and still able to get STAB, so I have been running Iron Head with it recently.
Let me know what you guys think :-) I think Metagross is going to shoot right back into OU or Ubers once the new games come out and its mega form is released. Mega Metagross is going to be one of the next biggest threats.