@Otaku
I understand your concerns, To be honest I'm not excited about Manaphy EX in the slightest, I rarely play water decks. I dot like to discus about upcoming cards and create different kind of views.
...Perhaps I should play Mega-Latios EX with target Whistle, doesn't sound that bad now I think about it.
Yes, if the opponent uses Lysandre, you will lose Burst Balloon at the end of his turn, but you force him to waste a Lysandre, if he has one in his hand."If this card is attached to a Pokemon, at the end of your opponent’s turn, discard this card."
Does it mean at the end of your opponent's next turn, or at the end of a turn that involves this Pokemon taking damage? Because it sounds like you can just avoid attacking that particular Pokemon (maybe Lysandre up a different one) and they'll lose it either way.