To start, most of this team tends to be outclassed in AG, notably Lucario and Koraidon, as J pointed out. This is going to be a large overhaul, so stay with me.
Meowscarada
Great Tusk @ Leftovers
Ability: Protosynthesis
Tera Type: Steel
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Stealth Rock
- Close Combat
- Headlong Rush
- Rapid Spin
Choice Band and Leech Seed is a bad combo, and Meowscarada is obsolete in AG, getting annihilated by Koraidon, Chien-Pao, etc. This Tusk set acts as a bulky attacker, while not being restricted by Band. Tera Steel to turn most weaknesses into resistances, SR and Rapid Spin enables it to be a nice spinner. Tusk over Treads because Tusk's weaknesses are less common in AG, as opposed to Treads' weaknesses in Fire, Ground, Fighting, etc.
Chien-Pao
Chien-Pao @ Focus Sash
Ability: Sword of Ruin
Tera Type: Ghost
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Brick Break
- Icicle Crash
- Sucker Punch
- Swords Dance
This set is more reliant on spinners, which will be explained later. For now, Swords Dance, Focus Sash, and Tera Ghost can usually get you a +2 or +4 boost on Icicle Crash or Sucker Punch (I prefer Ice Spinner, especially since it gets rid of terrain and abilities that depend on it like Quark Drive, but your preference), and Brick Break over Psychic Fangs for better coverage, you don't really need to be covering Fighting-types like Koraidon, since you have Icicle Crash.
Maushold
Flutter Mane @ Life Orb
Ability: Protosynthesis
Tera Type: Fire
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Mystical Fire
- Shadow Ball
- Moonblast
Another switch I'm making. Maushold is completely walled by any competent Ghost (the only prevalent AG ones being Houndstone and Flutter Mane), so I thought it'd be ironic to replace Maushold with Flutter Mane. The moveset is a pretty plain Calm Mind set, and the EVs guarantee at least speed tie with the unboosted twin 'Dons, Chien-Pao, and opposing Flutter Mane. You can also run a Timid 124 Spe spread to guarantee a Protosynthesis speed boost thanks to Koraidon while maxing SpD, but that can be used as you get more comfortable with the team. Sun Mystical Fire Tera Fire also hits like a truck.
Glimmora
Iron Bundle @ Choice Specs
Ability: Quark Drive
Tera Type: Ice
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Ice Beam
- Freeze-Dry
- Hydro Pump
- Flip Turn
Generally, Glimmora is a pretty subpar SpA attacker due to its crippling 4x Ground weakness, as well as other strong moves such as Band Koraidon's Collision Course. Since we have a nice lead in Tusk, let's add a SpA attacker. the fastest viable Pokémon in the tier, it outspends even scarves in Quark Drive, along with a monstrous SpA that is added to with Specs. Ice Beam and Freeze Dry are included to scare off the rare Dondozo, but also because this thing has pretty bad coverage. Flip Turn for momentum, and the EVs guarantee the outspeeding and Quark Drive speed boost.
Skeledirge
Miraidon @ Life Orb
Ability: Hadron Engine
Tera Type: Electric
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Calm Mind
- Electro Drift
- Overheat
- Dragon Pulse
As I mentioned in the comments, Skeledirge as a staller is pretty obsolete in AG. You're missing both 'Dons, so here are they. Standard Calm Mind set, with Life Orb and nice coverage. Sets terrain for Bundle as well.
Lucario
Koraidon @ Choice Band
Ability: Orichalcum Pulse
Tera Type: Fire
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Close Combat
- Outrage
- Flare Blitz
- U-turn
Pretty average Band Koraidon Set. U-Turn to pivot, Flare Blitz is ridiculous with Orichalcum Pulse, Tera Fire, and Band. Close Combat over Collision Course because if you get hit, then you didn't set up for this thing properly. Max speed to tie with FM, twin 'Dons, and Chien-Pao (be wary of Ice Shard). Do not underestimate U-Turn, it still deals great damage.
Okay, so as a summary, I swapped Meowscarada, Maushold, Glimmora, Skeledirge, and Lucario for Great Tusk, Flutter Mane, Iron Bundle, Miraidon, and Koraidon respectively, as well as changing Chien-Pao's set. Hope I helped!