If I understand right, you always have the option of claiming your deck search failed, and not pulling anything, even if there is something there. This is the case because your deck contents are not known to the game state, so your opponent can't confirm or disprove. What if both you and your opponent know it can't fail. Here's two examples:
PT Delcatty uses power circulation to get two energy back from discard. SF Bronzong puts a card back and searches for energy. Player claims there are no energy and shuffles deck without pulling anything.
Case two (more extreme because it is one card) Player uses pokemon communication to put a pokemon back on top of his or her deck. Then the player claims there is no pokemon in the deck and shuffles the deck without pulling anything.
Is this allowed?
PT Delcatty uses power circulation to get two energy back from discard. SF Bronzong puts a card back and searches for energy. Player claims there are no energy and shuffles deck without pulling anything.
Case two (more extreme because it is one card) Player uses pokemon communication to put a pokemon back on top of his or her deck. Then the player claims there is no pokemon in the deck and shuffles the deck without pulling anything.
Is this allowed?