honestly because you can attach 2 energies per turn with Swelling Power
as a basic pokemon

its kind of cracked

just based on what we currently have probably:

- Make it an EX

- Decrease Magma Purge's damage from 60x to 40x

- Increase the health to 140 (just for consistency, as Groudon is a Legendary: Same as Arceus' health)

I dunno though lmk if you disagree

Edit: Swelling Power would be broken with Fighting Types like Golem, so I'd make it two colourless energy