Aight so I'm struggling to figure out what I should use for my last moveslot for Mega Audino here...
Audino @ Audinite
Regenerator > Healer
Bold
248 HP, 252 Def, 8 SpAtt
- Calm Mind
- Wish
- Hyper Voice/Dazzling Gleam
- Thunderbolt/Flamethrower/Surf/Psyshock/Shadow Ball/Hyper Voice/Dazzling Gleam/Encore/Yawn/Sweet Kiss/Heal Bell
This works as a hybrid Cleric and bulky CM Sweeper, with Audino taking the former role at first and utilizing Regenerator to stay healthy, then Mega Evolves when you've eliminated threats to its potential to sweep. The problem is 4 Move Slot Syndrome; there's so much Mega Audino wishes it was capable of, but every option it uses limits it in some way too. Calm Mind and Wish are the staples here, with CM buffing its SpAtt and special bulk and Wish keeping it healthy. Third moveslot goes to a STAB move, with Hyper Voice being slightly higher in damage while Dazzling Gleam is better in terms of coverage, and each pairs with a different one of the alternate coverage moves better than the other. Now, speaking of the fourth moveslot, there's a LOT of things that can go there, all of them with things they can and cannot handle, but in general it's not too big a problem no matter which choices you make, although I'd say Psyshock and Shadow Ball are standouts since the former covers specially defensive enemies and the latter offers near perfect neutral coverage with either STAB. Encore, Yawn, and Sweet Kiss are options too; while they won't help in terms of coverage, they can ensure a free CM or Wish as well as shut down opposing setups and defensive pokemon. Even Heal Bell is an option to help keep Audino from getting too run down by status and help Audino fill that Cleric role better pre-Mega. The other options (T-Bolt, Flamethrower, Surf) all offer some decent additional coverage, all hitting most Steels (which seem to be Audino's biggest threat) at least neutrally. I guess these are better options to cover holes in your team's coverage as opposed to trying to make Mega Audino actually able to handle everything that comes its way.