Lysandre sent Gyarados to intimidate Tierno, Shauna and Trevor, wanting to see pictures Trevor took in Vaniville Town. Fortunately for the kids, Diantha arrived with her Gardevoir, claiming Lysandre has frightened the children too much. Later on, Lysandre was called for an important meeting and went off with Gyarados, claiming it was "one of the chosen ones".
After X infiltrated the Team Flare headquarters, he faced Lysandre. Lysandre showed him Korrina's Key Stone on the ring he wore and touched it, starting to Mega Evolve Gyarados. To continue his battle against Lysandre, X called his Quilladin and Charmeleon back and sent Manectric, Gengar and Kangaskhan. Mega Gyarados bit X's Manectric, who used Wild Charge and electrocuted Mega Gyarados. X noticed Mega Gyarados took less damage than a normal Gyarados would, as well as its Bite attack caused more damage, suspecting Mega Gyarados' type changed to water/dark. Lysandre commended X for the observation and continued the battle. X fooled Lysandre, who, in distaction, did not notice X Mega Evolved Kanga, who bashed Mega Gyarados' head.
|Waterfall||X & Y arc|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.