This post is from a low-reputation account and contains an unverified outbound link. Be cautious before clicking external links.
Evergree GX Attack can remove all Damage Counters from Celebi & Venusaur GX if at least 1 extra Energy is attached to it in addition to the required 4 Energy Cost.
Celebi & Venusaur GX is already very tough Pokemon (270 HP) and its GX Attack even tougher. That's why this GX Pokemon works well with Card that has Healing Effect in order to maintain its Full HP.
Full Article at https://ptcg92.blogspot.com/2019/10/celebi-venusaur-gx-team-up.html