A new Aggron, huh.
Since Metal needs Rainbow energy to function, this isn't as insufferable.
HP: 110. That's normal for Aggron but still a good number.
Heavy Blow: A bit costly and a curious successor from Base Set Machoke. And the React Energy trimuphs again.
Bound Crush: Heavy crush but at least can hit any Pokemon. Drawback but at least there is the Heavy Blow.
Energy Cost: fits in a Metal deck best.
Overall: Just pure power for the latest Modified formats, whatever it may be. If the payoff can be pulled off, then it will do very nicely. Just make sure you can pull it off in time.