Shiny Pokémon are incredibly rare, alternately colored versions of Pokémon. In Black 2 and White 2, the base odds of encountering a shiny Pokémon are 1 in 8192. While there's no direct 'chaining' method like in some other games, there are a few techniques to increase your chances:

- Masuda Method: Breed two Pokémon from different real-world language games. This significantly increases the odds of hatching a shiny egg to 1 in 1365.3. This is the most reliable method for shiny hunting specific Pokémon.
- Shiny Charm: After completing the National Pokédex (catching all 649 Pokémon), you can receive the Shiny Charm from Professor Juniper. This item increases the odds of encountering a shiny Pokémon in the wild and hatching shiny eggs to 1 in 2730.6.
- Soft Resetting: For static encounters (like legendary Pokémon or gift Pokémon), you can save in front of the Pokémon, encounter it, and if it's not shiny, soft reset your game (L+R+Start+Select) and try again. This can be very time-consuming but guarantees a shiny if you're persistent.
Shiny hunting requires immense patience, but the reward of a unique, colored Pokémon is often worth the effort for dedicated trainers.