Mirror Serena's Fennekin is a fire-type Pokémon owned by Mirror Serena.
Unlike her counterpart, Mirror Serena's Fennekin is more hostile and attacks fiercely. Mirror Serena used her in a battle with Ash, wanting to see if he really is from another world. Mirror Fennekin battled Froakie, who attacked her using Double Team and Bubble. Later, Mirror Serena used Mirror Fennekin to open cages of Pikachu and Mirror Pikachu, who were both captured by Team Rocket.