7th Gen Which should I get rid of for the Lunala to put it on my team.

[BaconSubPancakes]

Now I am trying to figure out which Pokemon to get rid of for my team.

Current team before summoning Lunala:

Decidueye: LvL 55
Leaf Blade
Razor Leaf
Spirit Shackle (with special Z move)
Brave Bird
Lycanroc: LvL 52
Stone Edge (with special Z move)
Crunch
Thunder Fang
Rock Tomb
Alolan Marowak: LvL51
Bone Club
Headbutt
Stomping Tantrum
Flame Charge
Noivern: LvL 50
Bite
Superfang
Dragon Claw
Airslash
Slowbro: LvL 58
Phychic
Rain Dance
Headbutt
Water Pulse
Metagross: LvL 46
Hammer Arm
Psychic
Meteor Mash
Zen Headbutt

I trained all of them from low levels.
I look first at the special Z crystals for Lyconroc which I am not getting rid of, and Decidueye I am also not getting rid of.

I need some opinions, who should I get rid of for my main six. Of course I'd train the other one in post game.

 

[EmTheGhost]

I'd switch either Slowbro or Metagross, so you won't end up having three Psychic Types. Personally, I'd go for Slowbro. Metagross is a pretty powerful Pokemon, after all; and it seems like you already have some coverage for Fire, Ground and Rock Types, so it's not like having a Water Type is essential...

(Also, this isn't what you asked about, and I don't want to seem critical, but have you considered switching Razor Leaf on your Decidueye for Leaf Blade?)