- Poké-Powers that end your turn are receiving errata to make it clear that you still end your turn if the Poké-Power is canceled, such as with Team Galactic's Invention G-103 Power Spray or by Alakazam's "Power Cancel" Poké-Power. Blastoise's correct card text should read: "(Poké-Power) Waterlog - Once during your turn (before your attack), you may use this power. If you do, your turn ends. Attach as many basic {W} Energy cards from your hand to any of your Pokémon in any way you like. This power can't be used if Blastoise is affected by a Special Condition."
Source:
Organized Play News (2009-05-01), PUI Rules Team (2009-05-07)