According to team planner, your team's major weaknesses are:
Ground
Steel
Fire
-Aegislash seems to be very good, but you might want to let it relearn King's Shield, so that you can get the -2 Atk drop if your oppoment uses Physical moves. Aegislash is also a Pokemon with high defense, so you do not need to worry much about going first, you can change it to either Shadow Claw or Night Slash since both of them have a base power of 70 with High critical hit ratio.
-Gengar covers your team's Steel weakness, and covers it's individual weaknesses too, Gengar would be a good candidate to Dynamax or Gigantamax. Although having good movepool and disabling, Gengar has to switch out often as Choice Scarf limits it's moves, which is annoying.
-Mimikyu is a decently strong Ghost type Pokemon, but a good idea of when to use Mimikyu is when your oppoment is on the last turn of their Dynamax, Dynamax only lasts three turns, so disguise is very useful. Wood Hammer bring a strong Grass type move, can be kept as it counters Ground.
-Dragapult, also having the Choice item, limits it's moves, if you are planning to use Flamethrower or Thunderbolt for the bonus effect, then you could try Tri-Attack, it also has a higher chance. I think you should not remove Flamethrower because if you put in Tri-Attack, all your moves are not very effective against Steel types, which once again counters steel.
- Sablelye can be a Staller mon, really not the best ghost type, decent, but you can use that knock Off, this seems like a perfect moveset, slowly taking damage from the burn while recovering your Pokemon
- The Eviolite has made this Staller Pokemon better than its evolution, but night shade isn't very well planned although getting a fixed 100 damage. An oppoment like Skarmony seems difficult to beat so you can have the option to change Night Shade to Destiny Bond, but that is just an opinion, it might not be the best.
I hoped I've helped!
