If this site has helped you, please consider following me on Twitter or Twitch, or chucking a donation to keep the website up.
Medaforce
From Medarot S Wiki
The Medaforce is a special attack that does not require anything but a functioning head part. It is activated by gaining charge, which is obtained through charging or by being damaged.
Some medals (like Hunter-type medals) gain Medaforce Charge after breaking enemy parts.
For a list of Medaforces, see Medaforce List.