Bakugan: Defenders of the Core

Completing a combo from the combo list will probably send enemies flying after 3 or 4 hits. So how do we get to 20? The easiest way is after beating the game. At that point, you get Maxus Dragonoid, who can do a 21 hit combo with a fully charged projectile attack.

But there's another more universal way to get high combos that will be helpful in getting "S" Rank for the Perfection trophy. With a combination of set-up punches and a combo ability card. If you don't press the button rapidly, putting space between inputs, you can get a hit combo up to 8-10 hits before sending the enemy flying.

Get a Bakugan with a combo ability card that does at least 15 hits. Dual Elfin, Magma Wilda, and Maxus Dragonoid all qualify, among others. Other Bakugan only have combo cards of 10 hits or even less. Let the ability card gauge charge all the way up, get a staggered manual combo going of at least 5 hits, then immediately transition into the combo ability card. It should continue the hit streak and go over 20.