So you've just defeated the Unova elite four and the champion after a tiresome match.
You burst into tears of joy, knowing your journey is complete. You await the champion to show you the Hall of Fame and restore your Pokemon's HP, receiving their well deserved rest.
But who has just traveled all the way from Kanto?
Who has just defeated all the gym leaders and elite four in the few minutes you were fighting Alder?
And who is going to challenge you to a battle RIGHT NOW?
GARY MOTHERFUCKING OAK.