Singles:
Audino@Audinite
EVs: 252 HP, 128 Def, 128 S Def
Nature: Bold
Ability: Regenerator-->Healer
-Toxic
-Heal Bell
-Wish
-Dazzling Gleam/Draining Kiss/Hyper Voice (whichever one appeals the most to you)
This is pretty much a staller set, with Toxic to slowly eat away at the opposing Pokemons HP and Heal Bell because Healer is almost useless in Singles. Wishkeeps you and other Pokémon alive. The last three attacking moves can be interchanged at your will. Also, the EVs lets it survive a few hits and stay alive as your Wish setup.
Doubles:
Audino@Audinite
EVs: 252 HP, 128 Def, 128 S Def
Nature: Bold
Ability: Regenerator-->Healer
-Heal Pulse
-Draining Kiss/Dazzling Gleam/Hyper Voice
-Toxic
-Protect/Wish
Healer is especially good in Doubles, because it eliminates the use of Heal Bell. Toxic can be used to stall, because thats what Audino M is pretty much used for. Wish is to keep you alive, Heal Pulse is to keep your teammate alive. Dazzling Gleam and Hyper Voice are generally more useful in doubles than Draining Kiss because it affects only the Pokémon on the opposing side. The EV spread allows you to stay in the longest, because Audino is your Healer setup.