This strategy is still being worked on, please tell me the flaws so I can fix them.
Bakugan:
Darkus Alpha Hydranoid HM, 670g's
Pyrus Altair(the epic assassin marble), 670g's
Haos Delta Drago HM, 650g'
TRAP: Any pyrus or darkus trap
Gate Cards:
Gate of Light
Night Fall
Rainbow
Ability Cards:
Darkness to Victory
Combo Battle
Light Mana
For the first battle, it must be a loss on purpose, with an Alpha Hydranoid. If you are wondering, "why is powerful bakugan being used to lose on purpose?", It's because Hydra is needed in battle 2. When you start, roll Hydra onto Gate Of Light. It's darkus bonus is 0, so you are most likely to lose. After that, use darkness to victory, and your opponent must play gate cards face-up from now on.
Total: 670 g's
Next, try to get Night Fall to be used. Do a roll like a turbine roll (spin roll) for best luck, with Pyrus Altair. When your baku stands, use combo battle and revive Alpha Hydranoid, and hope your enemy dosen't use pyrus...When the gate Night Fall is revealed, all pyrus bakugan will gain 400 g's because of Hydra. Hydra also gets a good bonus, making up for Altair's zero. Total: 1940 g's
(NOTE:Combo battle works good for the cards that say, If there is a <Insert 2 or 1 Atts. Here> bakugan at this battle, all <Insert Second 1 or 2 Att. Here> bakugan get +300 (or 400g) power. They let you get in the baku to cause the huge bonus, and the reciever.)
Next, you must use you Haos Delta Drago on Rainbow. If you have a trap ready for here, DO NOT USE IT! Traps will mess up the whole combo. When it is your chance, use Light Mana. You will get the bonus TWICE, because the highlighted gate attribute is Haos for Rainbow. Since you are also using 3 different kinds of bakugan in this brawl, you get +150 g-power from the rainbow effect, and +150 from the gate attribute bonus.
Total: 1190g's
(NOTE: The above paragraph works very well in big game, by using 1 bakugan of each attribute. Rainbow will give 300.)
When the 3rd bakugan is used, everything will be revived, so try to adapt to the situation and deliver the final strike.
I know there are flaws, for nothing is truly perfect. If you see one, please point it out.