Please rate my team. Any advice is welcome. ?

[JagLaser]

My current team, just an all around national deck team. As well as kartana or aegislash, any suggestions on rest of team are welcome.

Garchomp
Ability: Rough Skin. Item: Rocky Helmet
Scale Shot; Fire Fang;
Earthquake; Swords Dance
Jolly. Evs 252 atk 252 spd 6 spdef

Volcarona
Ability: Flame Body.
Item: Heavy Duty Boots
Bug Buzz; Quiver Dance;
Fire Blast; Giga Drain
Timid Evs 252 spak 252 spd 6 speed

Greninja
Ability: Protean. Item: Groundium Z
Dig(ZMove); Ice Punch; Gunk Shot; Spikes
Jolly or Hasty. EVS atk 252 spd 252

Gardevoir
Ability: Trace/Pixilate. Item: Gardevoirite
Hyper Voice; Mystical Fire;
Psyshock; Taunt
Timid Evs 252 spak 252 spd 6 def

Toxtricity low key
Ability: Punk Rock. Item: Life Orb
Boomburst; Overdrive;
Sludge Wave; Volt Switch
Timid Evs 252 spak 252 spd


The options

Kartana
Ability: BeastBoost Item: ? F sash maybe
Sacred Sword; Leaf Blade;
Smart Strike; Swords Dance or Knock Off
Ev: 252 atk 252 spd


Aegislash
Ability: Change Stance.
Item: Weakness Policy
Automotize; Shadow Ball;
Flash Cannon; Close Combat
Hasty Evs 252 spak 252 spd


Other suggestions welcome but I need a fighting move, a steel move, and ideally something effective against ghost types and/or water rypes

 

[JagLaser]

Also, should the 6th member be Aegislash or Kartana

 

[Sceptile Leaf Blade]

Can't use Gardevoirite or Greninja or Z-moves in Sword/Shield.

 

[JagLaser]

This is not in Sword shield, all of these things are applicable

 

[Sceptile Leaf Blade]

Well Toxtricity is only in gen 8 and Z- moves and Mega Gardevoir are only on 3DS games, so there is literally no environment where your team is possible

 

[Divine Retribution]

Well Toxtricity is only in gen 8 and Z- moves and Mega Gardevoir are only on 3DS games, so there is literally no environment where your team is possible

It's a simulator format.