Pokémon
Shaymin x1
Uxie x2
Mesprit x2
Azelf x2
Trainers
Poké Ball x2
Pokémon Communication x2
Professor's Research x2
Sabrina x2
Dawn x2
Celestic Town Elder x2
Cyrus x1
Strategy
Start with Uxie in active spot and Mesprit on bench. Give the first psychic energy to Uxie to give bonus psychic energy to Mesprit.
If Shaymin and Azelf are on bench, and Dawn is in hand, retreat to Mesprit and Dawn the energy left on Uxie to Mesprit. Use Supreme Blast and retreat to Uxie next turn to repeat process.