However, you can use the Pokémon Bank service (which was released later) to transfer Shiny Stones from later games to Black 2 or White 2.
Here's how it works:
1. Obtain a Shiny Stone: This can be done in Pokémon X/Y, ORAS, Sun/Moon, Ultra Sun/Ultra Moon, Let's Go Pikachu/Eevee, Sword/Shield, or later games.
2. Transfer to Pokémon Bank: Use Pokémon Bank to transfer the Shiny Stone to your Bank storage.
3. Transfer to Black 2 or White 2: Use the "Poke Transporter" (a separate app) to transfer Pokémon and items from your Bank to Black 2 or White 2.
Keep in mind that you'll need the following:
* A copy of Pokémon Black 2 or White 2
* Nintendo 3DS
* Pokémon Bank (subscription required)
* Poke Transporter (free)
* A Shiny Stone from a later game
Note: This process is only possible if you have the original games and access to a Nintendo 3DS.