Ruling Onix and Rainbow Energy

[catutie]

what happens if i attach

rainbow energy

to an

onix

with only 10 HP left?

would it be KOed or would it still have 10 HP left?

 

[DNA]

Both effects happen at the same time, so you can choose which one happens first. If you choose Rainbow first, Onix is KO'd; if you choose Onix first, he heals 10 and then takes 10.