What it does
Marvel Scale activates whenever the holder has a non-volatile status condition — Burn, Paralysis, Poison, Sleep, or Freeze. While statused, Defense is multiplied by 1.5. That's it. No move required, no turn cost.
The numbers matter here. Milotic has base 79 Defense. With 252 Defense EVs at Lv50, that's 131 (neutral nature) or 144 (Bold). Under Marvel Scale, that climbs to 196 or 216 respectively — substantial physical bulk, though it still falls short of a fully invested Steelix's 252. Burn normally cripples physical attackers, but Milotic doesn't attack physically, so the only downside is 1/16 HP loss per turn. You trade that chip damage for a dramatically thicker physical wall.
Stack that with Milotic's base 100 Sp.Def and access to Recover, and a statused Milotic becomes genuinely difficult to break from either side.
Who runs it
Milotic (2% usage). It's a niche pick in Champions, but players who bring it have a clear game plan: equip Flame Orb, trigger the burn on turn one, and let the Defense multiplier run.
How to use it
Equip Flame Orb. At the end of turn one, Milotic takes a burn, and from turn two onward Marvel Scale is permanently active. The cost is 1/16 HP per turn, which Recover can offset. You can also use Rest to cure the status entirely — but sleep still counts as a status condition, so Marvel Scale stays active through the nap.
If your opponent tries to burn Milotic with Will-O-Wisp, that works in your favor too. They just handed you the activation for free, and since Milotic has no physical attack to lose, there's no penalty on your end.
Tips & strategy
The interesting thing about Marvel Scale is what it does to the opponent's reads. Burn is normally a great play against bulky Water-types you want to wear down — against Milotic, it activates the ability and makes the Pokémon harder to break physically. If they lead with a Will-O-Wisp user expecting to cripple you, they're actually setting you up.
Milotic's real limit is HP attrition from Flame Orb. The goal isn't to wall forever — it's to buy enough turns of physical durability to control the field or give a teammate a clean switch-in. Once Milotic's HP gets low enough that Recover can't keep pace with the burn chip, it's time to pivot.