Speaking of evolutions, let's talk about the details of how to evolve your bakugan. Bakugan have up to three evolution stages: Hyper, Titan, and Maximus, in that order. You can skip evolution stages. For example, Hydorous Ultra can evolve straight into Maximus Hydorous Ultra, and Hyper Hydorous Ultra can too; however, you can't regress to a previous evolution stage. Titan Hydorous Ultra can evolve into Maximus Hydorous Ultra, but it CAN'T evolve into Hyper Hydorous Ultra. In case you're having trouble remembering the evolution order, here's an easy general rule: Bakugan can evolve into any evolution with a higher energy cost than their current forms.