If You enter one of the following codes at the name entry screen You'll get a reward.
180978772269 - Get 1,000 BP
332044292925 - Get 5,000 BP
423482942968 - Get 10,000 BP
449824934071 - Get Bronze Warius.
To unlock one or each of these go to the park for battles and make sure you have good bakugan and cards for all attributes!
Blade Tigrerra - Deafeat Runo with only non-hoas bakugan
Hydronoid - Deafeat Maskquerade with only darkus bakugan
Dual Hydronoid - Deafeat Maskquerade with only non-darkus bakugan
Delta Dragonoid - Deafeat Dan with only non-pyrus bakugan
Preyas - Deafeat Muracho with only aquos bakugan
Preyas 2 - Deafeat Muracho with only non-aquos bakugan
Hammer Goram - Deafeat Julie with only non-sub-terra bakugan
Gorem - Deafeat Julie with only sub-terra bakugan
Tigrerra - Deafat Runo with only haos bakugan
Dragonoid - Deafeat Dan with only pyrus bakugan