How do you get hulk buster in hulk Xbox 360?

As far as I know there is no red hulk. If you mean Maestro, you must destroy one building in each sector of new york city.

You only get Red Hulk if you register at Gamestop to buy him.

Go and grab busters, then kill yourself. And there you go. :)

you have to collect 5 gamma regulators throughout the game.