Originally Posted by arcemegus
Reshiram @ Rugged Helmet
252 Sp. Atk, 252 Def, 4 HP
Takes neutral damage from water attacks. Nitro Charge to boost Speed if necessary. Dragon Tail to remove Ground and Rock users from Field. Rugged Helmet to damage Attackers of said types.
252 Atk, 252 HP, 4 Speed, (Adamant nature, +Atk, -SpAtk)
Firstly, let's just assume Stealth Rock is off, lol. Or Ho-oh was switched on a predicted Nitro Charge.
Ho-oh's epic SpDef lets it swallow a Draco Meteor with certain ease. Can Recover any damage off or proceed to 2HKO with Earthquake.
Edit: Btw, Ho-oh gets Regeneration for DW ability, so it shouldn't care much about Dragon Tail.