How do you make leonidas evolve in the bakugan video game

It is very easy and simple.
As you know, your guardian bakugan on Bakugan Battle Brawlers The Video Game is Leonidas.
Leonidas hasn't evolved, yet Drago, Gorem, Tigrera, Preyas, Skyress, Hydranoid, and Vladiator. (Vladiator is Marduk's bakugan. He was released from the doom dimension, just like Leonidas. Therefore, Leonidas is a good bakugan and Vladiator is evil.)
Well, after you beat the Haos tournament, you are about to fight Marduk and Vladiator, and you by yourself. Why? Becuase the Darkus place is a place where only doom dimension bakugan can be on. (After you beat the whole game, any bakugan is welcome on the Darkus place.)
The battle brawlers (Dan, Shun, Marucho, Julie, and Runo) bakugan fall to the ground. But, they are able to give your Leonidas their powers to allow you to defeat Vladiator.
Now, your Leonidas has evolved into Omega Leonidas!
With ultimate power, he is able to knock out Vladiator. But you need to use him to beat him.
If your skill and battle is correct, Leonidas will take out Vladiator.
A video will show after you win the battle. Vladiator and Leonidas will both be returned to the doom dimension afterwards. But, the video isn't over yet.
Leonidas is able to return. Vladiator gave him his remains.
Now, you have an evolved bakugan.
Omega Leonidas is now able to get up to 900 g's! Enjoy your evolved bakugan!!!