Question

How to get Spiritomb in diamond?

Answer 1

• Go to Route 209 and place an Odd Keystone in the tower.
• Enter the Underground and talk to other players a total of 32 times.
• Interact with the Hallowed Tower. A level 25 Spiritomb will appear, and a battle with it will begin immediately.

Hallowed Tower -Bupbapedia

Comments

instead of talking to 32 players, you can do what I did:
1-ask a friend with d/p/p to play a little
2-in your game, go to the underground and stay near your base
3-in your friend's game, go to the underground and find your player
4-in your game talk to your frind's player and go inside your base
5- do it 31 more times.