Can the 
energy used for Volcanion's "High-Heat Blast" attack count as part of the "at least 4 Energy in play" bonus damage?
Yes, it can.
High-Heat Blast
Volcanion
- Type
- POKEMON
- HP
- 120
- Energy Type
- Stage
- BASIC
- Retreat Cost
- Weakness
x2- Rarity
- PROMO
- Set
- Sun & Moon Promos (SMP)
- Number
- 179/250
Attacks
Flare StarterSearch your deck for a Energy card and attach it to 1 of your Pokémon. If you go second and it's your first turn, instead search for up to 3 Energy cards and attach them to your Pokémon in any way you like. Then, shuffle your deck.
High-Heat BlastIf you have at least 4 Energy in play, this attack does 60 more damage.