Question: what to do after defeating elite four in pokemon y?
Answer: Trade Pokemon with your friend Shauna. ...  Visit the Sycamore Pokemon Lab to Pick Up the Poke Radar. ...  Trade Pokemon with Diantha. ...  Get the last O-Power. ...  Enter Sushi High Roller. ...  Partake in a Battle Test. ...  Snag the National Pokedex. ...  Get a Max Revive inside Kiloude Station.