Edit: Sorry, no Dialgas, Palkias or Arceus', thats in the next chapter
But before you punched him, he gave you a bucket of potions and Enigma Berries stolen from Darkrai to prove to you he wanted to be good. He also used Ice Heal and you were healed. He also gave you his White Herbs and told you he can be a great alliance to the team.
Darkrai didnt want to risk being caught, so he and Deoxys (being good with Space tech) flew to the Transdimensional Galaxy in a spaceship.