Always get Max Drive after any Form Transformation and Easy Form
First (if you don't know how to level up a certain form), go to the main menu and then status then go to the form you want to level up.
Second, pick a good place that's good for leveling up that form (I can't help you decide and make sure it's near a save point).
Third, go to that place you picked and transform into that form you want to level up and fight the enemies.
Fourth, After you defeted all the enemies, go directly to the save point (make sure you're still in that form) and go to the world map.
Fifth, go back to that same place you were just in and look at you're drive gauge (it's full!), continue these steps for as much as you want for any of the forms to train them.
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