Replace basic energy with some Blend energy Psychic/Grass/Fire/Dark
Replace Yamask with Eevee
Replace Mewtwo EX with leafeon (1 less energy and does 20x all energy on all foes pokemon)
Replace Cofagrigus with a Mew EX (Blend energy will help you here) Shaymin EX or Virision EX
1 of 2 energy search should be cilan
Virizon EX should replace the other energy search
Add Gscope or Gbooster to replace reversal trigger
These are all optional especially the last thing as that is not necessarily an improvement but more of a change one may like but another may not.