How do I get an Absolite in XY?

Question

I want to Mega Evolve my Absol, but I don't know how.

Answer 1

Once you finish the game, head to Kilourde Town, the area you gain access to for completing the game. Go to the very top and you'll find your rival. Battle them, and they'll give you an Absolite upon victory.

Answer 2

Once you finish the game, go to Lumiose Station, and the Professors Assistants, AKA, the Masked Heroes, will give you a boarding passed. You will then go to Kiloude City. Find a building called the Battle Maison. Challenge it once, then look around Kiloude City. You will then find your rival, Calem or Serena, depending on which gender you chose. Battle him or her, defeat her, and they will give you an Absolite. Then as for extra info, after that, go to the sundial in Anistar City, and you will be able to Power Up your Mega Ring, to where you will be able to detect mega stones at 8PM to 9PM.