I went for Timid. The idea was to give moves like Dark Pulse and Flamethrower a needed boost and give Speed the gain, with no emphasis on the Attack stat.
I'm reconsidering, however. Even though this guide suggests Nasty Plot and a Hidden Power to round out the moveset (I chose Flamethrower over Fire Blast for accuracy), I don't have the patience for Hidden Power breeding and going for a spread like 31/30/29/31/29/30 or somesuch. I could mix in a Pursuit/Sucker Punch trap, or I could put Solar Beam and use a Mental Herb instead of a Life Orb (whichever gets rid of the one-turn chargeup wait for an instant attack). Nasty Plot might stay in that scenario.
BTW, I did get the Shiny Metagross (6IV) for a 1IV Shiny Eevee. Trade of the day. I had offered a similar 6IV.