Mega-Evolved Pokémon revert after a completed trip, or when they are defeated or switched out. Mega Evolving will send out a shockwave that damages enemy Pokémon. Serena chose the Fox Pokémon as her starter. Fennekin evolved into a Braixen in Battling with Elegance and a Big Smile! Pokémon so that X might choose one and stop his shut-in behavior. Although initially reluctant, X decided to take Chespin and named him Marisso in Chespin Sows the Seeds of Change.
Tierno then allows the player to choose a starter Pokémon, Fennekin, Froakie, or Chespin. After the player chooses their starter, Shauna will choose the Pokémon that is weak to the player's starter while Serena/Calem will take the Pokémon that is strong against the player's starter, in traditional rival fashion.