There is none. Margulis never fought anyone except the party who are certainly not planet busters when they battle him.
Jin fought some strong characters but only in gameplay. You could perfectly switch Jin out for say.... (please log in to view the image)
Lol
MOMO beat plenty of planet busters!
Yeah, doesn't work.
__________________ Earth is a beautiful addition to the Galaxy...but an even finer accessory on the hand of a God.
the final gnosis at the end of xenosga 1 wasnt a planet buster?????? lol, even kosmos and telos's phase transfer cannons {not TWS} can easily destroy a star.