Due to the introduction of the 18th Pokémon type , several Pokémon’s types were retconned into being full or part Fairy.
• Gardevoir was mono Psychic type but is now Psychic / Fairy.
• Marill was dual Water / Normal type but is now Water / Fairy.
• Jigglypuff was mono Normal type but is now Normal / Fairy.
• Mawile was mono Steel type but is now Steel / Fairy , as is its Mega Evolution.
Other Pokémon that aren’t Fairy type were retyped also.
• Ampharos’s Mega Evolution, is Electric / Dragon , as opposed to standard Ampharos’s mono Electric typing.
• Azurill is now Water / Fairy as opposed to its previous Normal typing.
• Mega Charizard X is Fire / Dragon as opposed to it’s standard Fire / Flying typing.