When you face off against the Death Saucer (the giant flying saucer), put Neo G Red at the beginning of your force, preferably leveled up as much as possible. Get him on top of the Death Saucer somehow and continuously use his Neo G Crash technique (press X on the Death Saucer. This is an easy way to not only rack up a 150-hit combo, but also to end the battle in about two minutes.