You attack with regigigas. Try to slow opponent down with Mesprit psychic bind, then use regice to put two energy in discard. Sacrifice Mesprit. Powering up regigigas and attack from there. I do want some input on this deck for help. I know there is not mewtwo or Machamp counter at this time, but I would like more help with the trainer line.
Pokemon
2 x Regigigas LA-37
1 x Regigigas DP40
1 x Regigigas LV.X
2 x Uxie
1 x Azelf
2 x Mesprit
1 x Regice
1 x Unown Q
Trainer/Supporter/Stadium
4 x Pokemon Collector
3 x Bebe's Search
1 x Luxury Ball
2 x Premier Ball
3 x Pokemon Communication
3 x Energy Exchanger
3 x Victory Medal
4 x Pokemon Rescue
1 x Palmer's Contribution
3 x Professor Oak's New Theory
2 x Seeker
2 x Snowpoint Temple
1 x Expert Belt
Energy
3 x Call Energy - Special
2 x Double Colorless Energy - Special
4 x Water Energy - Basic
4 x Fighting Energy - Basic
4 x Metal Energy - Basic
Pokemon
2 x Regigigas LA-37
1 x Regigigas DP40
1 x Regigigas LV.X
2 x Uxie
1 x Azelf
2 x Mesprit
1 x Regice
1 x Unown Q
Trainer/Supporter/Stadium
4 x Pokemon Collector
3 x Bebe's Search
1 x Luxury Ball
2 x Premier Ball
3 x Pokemon Communication
3 x Energy Exchanger
3 x Victory Medal
4 x Pokemon Rescue
1 x Palmer's Contribution
3 x Professor Oak's New Theory
2 x Seeker
2 x Snowpoint Temple
1 x Expert Belt
Energy
3 x Call Energy - Special
2 x Double Colorless Energy - Special
4 x Water Energy - Basic
4 x Fighting Energy - Basic
4 x Metal Energy - Basic