1. The saga of "Perfect way of balancing in Inclement Emerald" continues. That's great to hear!
2. It's exactly how I use it, Delphox (which I'll shamelessly goint take a moment to say that it needs a little buff on the Speed side, like +10 approx.) with Heat Wave on doubles with a Eviolite Togetic with Follow Me, the "problem" is that outside that niche, you don't get much value against every Special Attacker (or Fire types because of the burn immunity), but I suppose every ability, Pokémon, attack, etc, has its moments, it's just that, as you perfectly said, they have other better and well rounded abilities like Delphox's Magic Guard. I just wish Pyromancy would work with Mystical Fire or Flame Charge (even if that means lower burn chance to balance it), or have Pyromancy users learn something like Lava Plume for guaranteed burns at the cost of hitting your partner in doubles and less power than other Fire moves for example.
Anyway, thanks for the response!