What Ghost type move deals the most damage?

Question

I was just wondering.

Answer 1

Last Respects caps at 5050 BP after 100 teammates have fainted in the same battle. Other than this, three Z-Moves occupy the top three slots:

1. Menacing Moonraze Maelstrom (200 BP)
2. Soul-Stealing 7-Star Strike (195 BP)
3. Sinister Arrow Raid (180 BP)

Limiting your question to more conventional moves still yields Shadow Force at 120 BP as the strongest Ghost type move.

Answer 2

http://pokemondb.net/move/shadow-force
Shadow Force at 120 BP.
100 Accuracy
Physcial.

The user of Shadow Force will vanish instantly on the first turn,
disappearing from view and becoming invulnerable to most attacks. On
the second turn, Shadow Force deals damage and can hit Pokemon using
Protect or Detect. It also removes their effect for the rest of the
turn (in double and triple battles). While disappeared, the Pokemon can only be hit by moves from No Guard. Pokemon, or any move following an identify move.
If the user is holding a Power Herb, Shadow Force executes in one
turn.

Answer 3

Shadow Force deals the most damage as a ghost type move.

• It has 120 power.
• 100 accuracy.
• It' s a Physical move
• It' s a two-turn attack
• It' s able to hit Pokemon behind Protect or Detect

Hope I helped!