In the mainline Pokémon games:
* Pokémon Black 2/White 2: You can find a Razor Claw in Undella Bay by fishing with a Super Rod.
* Pokémon X/Y: You can find a Razor Claw in Azure Bay by fishing with a Super Rod.
* Pokémon Sun/Moon/Ultra Sun/Ultra Moon: You can find a Razor Claw in Seafolk Village by fishing with a Super Rod.
* Pokémon Let's Go Pikachu/Eevee: You can find a Razor Claw in Route 2 by fishing with a Super Rod.
* Pokémon Sword/Shield: You can find a Razor Claw in Lake of Outrage by fishing with a Super Rod.
Other ways to obtain a Razor Claw:
* Trading: You can trade with other players to get a Razor Claw.
* Pokémon Bank: If you have a Razor Claw stored in Pokémon Bank, you can transfer it to your current game.
* Events: Occasionally, Razor Claws are given out during special events.
Note: The exact location and method of obtaining a Razor Claw may vary depending on the specific Pokémon game you are playing.
Let me know if you have any more questions!