How do you get night slash in pearl?

In Pokémon Pearl, Night Slash is a Dark-type move that can be learned by certain Pokémon through leveling up or by using a TM. Specifically, you can teach Night Slash to Pokémon like Sneasel or Honchkrow via leveling up. Additionally, you can find TM87 for Night Slash in the game, which is located in the Victory Road area. Make sure to check the compatibility of the Pokémon you want to teach it to, as not all Pokémon can learn the move.