Basically what I did makes his powers depend on the plate he holds. If he holds the dragon plate he can learn dragon attacks and gets dragon like traits and some super strength. If he uses the water plate he gets fish like traits and can use water attacks and so on and so forth. The only problem is that Arceus doesn't have any weak dragon attacks so I cut Dragon Claw, and Dragon Pulse's attack power in half. I'm also thinking of adding punishment to his move pool as Arceus starts out with it normally.
Ok, me and Fuyu reviewed your character. You need more details. The appearence especially needs some work. Also, we have a problem with you being able to use a powerful type of attack like Judgement after learning about your powers without serious backlash. Tone the powers back a bit, and let us get to know your character a bit better. Ok?