Audino is mostly there for Experience gain. Its only use in battle is as a team supporter. It has a lot of moves which can help your team in Double/Triple battles such as: Helping Hand, Simple Beam, Heal Pulse, Light Screen, Safeguard, Reflect, Round, Trick Room, Sunny Day, Rain Dance, Heal Bell, and Lucky Chant, all in addition to the ability Healer. However, this probably won't be enough to warrant a spot on your team, but it is your choice.