I am relatively new to Pokémon showdown (I started playing about a week ago) so feel free to criticize the heck out of my team so I can learn :)
Zacian-Crowned @ Rusted Sword
Ability: Intrepid Sword
EVs: 252 Atk / 4 Def / 252 Spe
- Play Rough
- Swords Dance
- Close Combat
- Behemoth Blade
Jirachi @ Focus Sash
Ability: Serene Grace
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Iron Head
- U-turn
- Fire Punch
- Drain Punch
Marshadow @ Focus Sash
Ability: Technician
EVs: 252 Atk / 4 SpD / 252 Spe
- Spectral Thief
- Shadow Sneak
- Close Combat
- Stone Edge
Eternatus @ Black Sludge
Ability: Pressure
EVs: 4 HP / 252 SpA / 252 Spe
IVs: 0 Atk
- Toxic
- Flamethrower
- Recover
- Dynamax Cannon
Blaziken @ Focus Sash
Ability: Speed Boost
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
- Agility
- Fire Blast
- Flame Charge
- Brave Bird
Xerneas @ Power Herb
Ability: Fairy Aura
EVs: 184 HP / 28 Def / 252 SpA / 44 Spe
Modest Nature
IVs: 0 Atk
- Thunder
- Geomancy
- Moonblast
- Focus Blast
Zacian-Crowned @ Rusted Sword
Ability: Intrepid Sword
EVs: 252 Atk / 4 Def / 252 Spe
- Play Rough
- Swords Dance
- Close Combat
- Behemoth Blade
Jirachi @ Focus Sash
Ability: Serene Grace
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Iron Head
- U-turn
- Fire Punch
- Drain Punch
Marshadow @ Focus Sash
Ability: Technician
EVs: 252 Atk / 4 SpD / 252 Spe
- Spectral Thief
- Shadow Sneak
- Close Combat
- Stone Edge
Eternatus @ Black Sludge
Ability: Pressure
EVs: 4 HP / 252 SpA / 252 Spe
IVs: 0 Atk
- Toxic
- Flamethrower
- Recover
- Dynamax Cannon
Blaziken @ Focus Sash
Ability: Speed Boost
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
- Agility
- Fire Blast
- Flame Charge
- Brave Bird
Xerneas @ Power Herb
Ability: Fairy Aura
EVs: 184 HP / 28 Def / 252 SpA / 44 Spe
Modest Nature
IVs: 0 Atk
- Thunder
- Geomancy
- Moonblast
- Focus Blast