Adaptability and Timid have been my preferences with past PGZs. I think I'm going to go for Adaptability, Modest, HP Fire. Maybe HP fighting. Combined with Dark Pulse, HP Fighting would take care of everything that resists the 2x tri-attack, but I'd be screwed if I faced a Metagross, Skarmory, or Scizor. HP Ground is good, but it's too easy for opponents to resist.