Interested in using a Metagross in the Hoenn Battle Frontier, but I was sure on how to go about it. My Gift Beldum has a serious nature and "above average" IVs with a specialty in Special Attack according to the Frontier reader.

What's a good Metagross moveset for places like the Battle Arena? I'm hesitant to include Meteor Mash because missed attacks can spell the end of a run altogether, and I'm not sure if Explosion is worth the tradeoff in coverage. Any advice?