Swampert: EarthQuake, Waterfall, counter, stealth rock
Dusknoir:Shadow Ball, Fire Punch, Disable, Confuse Ray
Cacturne:Giga Drain, Payback, Seed Bomb, Sand Storm
Swalot:Sludge Bomb, Yawn, Ice Beam, Rest
Salamence Dragon Claw, Fly, FlameThrower, Dragon Dance
Metagross:Psychic, Earth Quake, Meteor Mash, Reflect
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Unless you're intentionally making a lot of mixed attackers, it's usually better to just utilize the Pokemon's higher attack stat. I'd replace psychic with zen headbut for Metagross as an example, taking advantage of his high physical attack. Salamence can be a great mixed attacker if EV'd properly though. :)