How to Beat The Satan Super Boss in SMTV:V

[@Vivizor]

There's something I've learned that not many people do. If you start the Satan battle with only the MC out, Megido Ark will only have 120 power, which cannot kill you even at 999 magic with enough vitality and Max HP. If you summon a demon with Omagatoki Strategize, you can get your whole party in safely and even get a Luster Candy.