The Pokemon was previously not known to evolve from, or to, any other form.
Here’s Nintendo’s description:
Before Mega Evolving, Audino is known to use the feelers on its ears to tell how others are feeling or when a Pokemon Egg might hatch. It may have either the Healer Ability or the Regenerator Ability. After Mega Evolving, Mega Audino adds Fairy-type to its Normal-type, automatically gaining all the advantages of a Fairy-type Pokemon. Mega Audino also always has the Healer Ability.
Thanks to its improved Defense and Special Defense stats, Mega Audino can be a great support in Double Battles.
Watch the trailer below. View the screenshots at the gallery.