None of what you said disproves what I said; I was indeed concerned about fringe cases... because "Black Ballista" on Black Kyurem-EX (PLS)
also took out all commonly played Pokémon in one shot, at least during its time as a preeminent attacker.
@biffthepotato focused on the difficulty caused by Black Kyurem-EX needing an [L] Energy, which is why I first pointed out that it really wasn't a big burden; a small one, sure, but not a big one. I moved onto the damage output relative to max HP scores because that is honestly about as much of a problem as that lone [L] Energy requirement. As in, both are almost non-issues.
Blastoise (BCR) rose to prominence even though Pokémon Catcher didn't require a coin flip back then and first turn attacks were a thing... however, even with tricks like Archie's Ace in the Hole it isn't exactly a strong competitor in Expanded. It also had given up on Black Kyurem-EX (PLS). Magnezone (BKT) never managed to prove itself in competitive play, so I'm not hopeful for the [M] version. Could I be wrong? Absolutely.