The Compendium said:== BURSTING UP (Typhlosion EX - EX:Unseen Forces)
Q. Say I've got Energy Root attached to Quilava, and then I evolve into Typhlosion-EX from my hand. Is Energy Root discarded before "Bursting Up" triggers, or does it stop "Bursting Up" and then get discarded because it is attached to a Pokemon EX?
A. Since these actions both happen at the same time, it would be player's choice to resolve it in the order that they want. (Apr 20, 2006 PUI Rules Team)