Are you allowed to use a trainer card even if you know it will not produce anything just to get the card out of your hand? For example, If MewTwo Ex were my active Pokemon, could I play Wally's training? (Wally says search your deck for an eveolvement, it doesn't say you have to find one!) Or, say I used an energy search last turn and found that no more basic energy was in my deck. Could I still play an energy search next turn?