Bisharp pairs well with Mega Gallade because it can handle Fairy and Ghost Pokemon. It also makes a somewhat shaky check to Flying Pokemon, though:
-Sucker Punch
-Iron Head
-Knock Off
-Pursuit/Swords Dance
Nature: Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb/Sharp Beak/Sky Plate
Ability: Defiant
Mega Gallade is very versatile, so it has plenty of options to go with:
-Swords Dance
-Close Combat
-Zen Headbutt/Ice Punch
-Knock Off/Ice Punch/Will-o-Wisp/Taunt/Destiny Bond/Shadow Sneak
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Galladite
or
-Substitute
-Swords Dance/Bulk Up
-Drain Punch
-Knock Off/Zen Headbutt/Ice Punch
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Galladite
or
-Close Combat
-Zen Headbutt/Ice Punch
-Knock Off/Ice Punch
-Taunt/Will-o-Wisp/Destiny Bond
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Galladite
Latias also pairs well with both, as it can handle Keldeo:
-Draco Meteor
-Psyshock
-Defog (4th gen move only)
-Healing Wish
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb
Diggersby also works with Mega Gallade because of their shared ability to wear down each other's counters and breaking down stall:
-Swords Dance
-Return
-Earthquake
-Quick Attack
Nature: Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb
Ability: Huge Power
Wash Rotom also works with Gallade + Diggersby, as it can check fast threats, like Choice Scarf Therian Landorus:
-Volt Switch
-Hydro Pump
-Will-o-Wisp
-Pain Split/Rest
Nature: Bold/Calm
EVs: 248 HP/216 Def/44 Spe (Bold) or 248 HP/216 SDef/44 Spe (Calm)
Item: Leftovers/Chesto Berry
Stealth Rock support is also crucial, as it can net the team KOs they wouldn't normally get:
Therian Landorus:
-Stealth Rock
-Earthquake
-U-turn
-Stone Edge/Knock Off/Rock Slide
Nature: Impish
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers
Ferrothorn:
-Stealth Rock/Spikes
-Leech Seed
-Power Whip/Gyro Ball
-Gyro Ball/Protect/Thunder Wave
Nature: Relaxed
EVs: 252 HP/88 Def/168 SDef
Item: Leftovers/Shed Shell
Ability: Iron Barbs
Tyranitar:
-Stealth Rock
-Crunch/Pursuit
-Fire Blast
-Ice Beam/Rock Slide/Thunder Wave
Nature: Sassy
EVs: 248 HP/136 Def/124 SDef
Item: Leftovers
Ability: Sand Stream
Terrakion:
-Stealth Rock
-Stone Edge
-Close Combat
-Taunt/Swords Dance
Nature: Jolly
EVs: 252 SAtk/4 SDef/252 Spe
Item: Focus Sash/Life Orb
Empoleon:
-Stealth Rock
-Scald
-Defog
-Roar/Protect/Toxic
Nature: Calm
EVs: 248 HP/8 Def/252 SDef
Item: Leftovers
Ability: Torrent
Heatran:
-Stealth Rock
-Lava Plume
-Toxic
-Taunt/Earth Power/Roar
Nature: Calm
EVs: 248 HP/192 SDef/68 Spe
Item: Leftovers