N, Colress, and Friends Do Stuff is a minor episode from season seven.
N is forced to board the Plasma Frigate. He finds that Pokemon's energy is being harnessed to power it, so he works to stop Ghetsis. Eventually he saves the Pokemon, but he has to jump off the ship. As he is falling, he grabs his necklace, which turns up to be a sort of whistle, and blows it. Reshiram and Zekrom show up to save him, fighting over who he owns until they realize he's still falling. At that point they simply agree on Zekrom.
"N has to 'infiltrate' the Plasma Frigate."