Apparently Clodsire already has an analysis that mentions abilities.
> Water Absorb is the preferred ability, as it deters Iron Bundle's Hydro Pump and more comfortably tanks Draco Meteor from Miraidon, since Unaware would otherwise ignore the Draco Meteor special attack drop. It also checks Tera Water Miraidon, which is an important trait it possesses over Ting-Lu. Unaware checks non-Life Orb Calm Mind Miraidon while beating Calm Mind + Taunt Flutter Mane, as well as making Iron Moth's Fiery Dance boosts less of a threat.