Metabee's Parts:

HEAD: Missile
RIGHT ARM: Sweat cloak (to Counter a few attacks)
LEFT ARM: Arm Shutter (to defend yourself against Missiles and Napalms)
LEGS: Ochitsuka

Use Metabee's Sweat Cloak to prepare a Counter to send all attacks from Mega Emperor back to him, with a major Damage result.

Also give one of your medabots (Partner 1 or 2) "Destroy" Parts to get rid of those monsters.