TONS & TONS of WORK!
Had a late teen who was the son of a friend of ours stay with us and as long as he was occupied he was awesome!
Whether it be video game or work- which was much better to keep his attention, he was the model citizen.
He was working as a furniture mover working 12-14 hours per day 7 days a week and he loved it and of course the money.
Soon as the company laid off their workers he became bored and got into trouble and is serving 20 years for arson- he burned down an abandoned already falling down house...
But physical labor is the best thing for that type of mental issue and just like the Chinese Proverb about the little demon a man made his "pet", if you let him be idle he'll have the neighbor kid roasting on a spit when you get home!