Attacks » Power Creation
For Xerneas' "Power Creation" attack, does moving damage counters off of Xerneas to another Pokemon count as "Healing"?
No, moving damage counters off a Pokemon is not the same as healing damage (similar as to how moving damage counters onto a Pokemon is not the same as doing damage to it).
Source: BREAKthrough FAQ (2015-11-19), TPCi Rules Team (2015-11-19)
Attacks » Power Creation
For Xerneas' "Power Creation" attack, do I need to heal all damage from Xerneas in order for the attack to do +80 more damage, or can I just heal some damage in order to get the benefit?
As long as you have healed any damage from Xerneas this turn, you get the bonus damage effect.
Source: BREAKthrough FAQ (2015-11-19), TPCi Rules Team (2015-11-19)