Question

What are all of the moves that can't be selected during a battle in Gen 8?

Answer 1

I'll save some time by grouping some together:
All Z-moves
All Partner Eevee and Partner Pikachu moves

Now the individual ones:
Assist
Barrage
Barrier
Bestow
Bide
Bone Club
Bubble
Camouflage
Captivate
Chip Away
Clamp
Comet Punch
Constrict
Dizzy Punch
Double Slap
Dragon Rage
Egg Bomb
Embargo
Feint Attack
Flame Burst
Flash
Foresight
Frustration
Grass Whistle
Heal Block
Heal Order
Heart Stamp
Hidden Power
Ice Ball
Ion Deluge
Jump Kick
Karate Chop
Lucky Chant
Magnet Bomb
Magnitude
Me First
Meditate
Miracle Eye
Mirror Move
Mirror Shot
Mud Bomb
Mud Sport
Natural Gift
Needle Arm
Nightmare
Odor Sleuth
Ominous Wind
Psywave
Punishment
Pursuit
Rage
Razor Wind
Refresh
Return
Rock Climb
Rolling Kick
Rototiller
Secret Power
Sharpen
Signal Beam
Silver Wind
Sky Drop
Sky Uppercut
Smelling Salts
Snatch
Sonic Boom
Spider Web
Spike Cannon
Spotlight
Steamroller
Synchronoise
Telekinesis
Trump Card
Twineedle
Wake-Up Slap
Water Sport
Wring Out

Source

Hope I helped!

Comments

Thanks! Now I wonder what was the point of adding those moves in Gen 8 if you can't use them...

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Mostly so if a Pokemon already had that move, and was transferred, it would actually be able to transfer, I think.

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Probably to reduce the likelihood of the game crashing