Yanmega can easily be added to decks since its attack doesn't require any specific type of Energy.

Dialga ex is an amazing Energy Accelerator providing two energies while dishing out damage.

Yanmega ex and Dialga ex can both be found in the Space-Time Smackdown (Dialga) pack.

Struggles against decks that can quickly set-up like Pikachu ex.

May be inconsistent because of its Attack cost.