Tangrowth's "Power Whip" attack should say, "This attack does 10 damage for each Energy from basic Energy cards attached to Tangrowth to that Pokemon."



x2
-20
Power WhipChoose 1 of your opponent's Pokémon. This attack does 10 damage for each Energy attached to Carnivine G to that Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)

Grass KnotDoes 20 damage plus 10 more damage for each Colorless Energy in the Defending Pokémon's Retreat Cost (after applying effects to the Retreat Cost).
Tangrowth's "Power Whip" attack should say, "This attack does 10 damage for each Energy from basic Energy cards attached to Tangrowth to that Pokemon."
If I have Hiding Energy or Snow Leaf Badge attached to my Active Pokemon, would my opponent's Leafeon VMAX's "Grass Knot" attack do any damage to it or not? If yes, would "Phoebe" remove the effect of Hiding Energy or Snow Leaf Badge for the damage calculation of "Grass Knot"?
The effects of Hiding Energy and Snow Leaf Badge are not blocking any damage from the attacking Pokemon, they are changing the stats of the Pokemon they are attached to. So they are not really affecting the damage done by Grass Knot; it is still 60x the Retreat Cost, but the Retreat Cost is now effectively zero. And since those cards are not affecting the damage being done (they're only affecting the Retreat Cost), Phoebe will not help it do more damage.