ZardX can use DPunch pretty well since it's boosted by Tough Claws and also somewhat cripples would-be switch ins. Can also more reliably kill TTar and BalloonTran
Other potential abusers:
Conkeldurr, Rhydon+, Snorlax, Tyranitar, Dragonite, Azumarill, Zangoose, Metagross and Jirachi (not Serene Grace boosted by appreciates fighting coverage, and parafusionflinch bullshit), Pikachu (lol).
Zap Cannon:
Regis, Porys, Magne-line, Elektross?, Gengar, Starmie, Zapdos, Jolteon, Togekiss, Slowking, Raikou.
Inferno:
Zard, Houdoom, Victini, Chandelure.