Forced Mega Evolution

Synopsis
When some of Elizabeth's Pokémon play outside, Alva comes out of nowhere and forces the ones capable of Mega Evolving to Mega Evolve with his Mega Waves. Luckily, she manages to stop them and it doesn't end up being permanent like Bubblegum.

Transcript
Dragonet, Yaypeace, and Loaffey were outside in the apartment yard, relaxing in the sun.