Required: Mermaid Medal (lvl 30 or higher) or Ghost Medal (lvl 60 or higher.

Make sure your far enough in the game.
Equip the parts with the most Armor:
HEAD: Clear Armor
RIGHT ARM: Right Guard
LEFT ARM: Great Shield
LEGS: Burly or Chauffeur.
equip those parts to a male tinpet, but also the medal above.

Start a medafight, build up a medaforce. next use the medaforce: Schrapnel Attack so all parts will damage to half, to defeat a medabot easily.