A few weeks ago Blastoise ex was fixed to allow it to heal Saturation Wooper/Quagsire before damaging it from Energy Rain:
This was done by doing the 10 damage first, then attaching the Energy card. However, this created another bug, which was the Energy disappearing if the Power KOed the Pokémon that was to receive it:
The fix for this was to attach the Energy first, then do damage:
But this causes the initial problem (with Saturation) to arise again.