- Can I use Professor Elm's Training Method if there are zero cards left in my deck?
- No, you cannot search through your deck if there's nothing there to search. If there are cards in the deck you can fail to find a Pokemon because you don't know what may be in a deck, but since you do know whether there are ANY cards or not you cannot search through an empty deck.
Source:
PUI Rules Team (2011-09-22)