Rescue Energy

[Xicious]

If I have Rescue Energy attached to a Machamp level x that I rare candied and it's knocked out by damage what cards are returned to my hand? Also what would happen if I had used his strong willed attack prior to it being ko'd from damage, would I have the option of not flipping the coin and returning said card/s to my hand?

 

[PokePop]

You would return all of Machamp's stages to your hand, including the Level X.

As for Strong Willed, that is done before you resolve the KO, so Rescue Energy has no effect on that. You don't get to choose whether you resolve that effect.