Notably, the Dark Mutant looks remarkably similar to the Mega Mewtwo Y, a Mega Evolution for the first-generation legendary Pokémon Mewtwo. Between all of its regular Pals and the special "Fusion ...
Nidoking in a dark energy deck plays pretty much identically, could do a decent amount of damage given Mewtwo's weakness, but ...
The downside is that you can't fire off Psydrive every turn, and the introduction of Dark energy means you might struggle to get the Psychic power that Mewtwo needs. Still, it's effective when ...