Rebattleable Trainers in Pokemon Black and White 2:
* Gym Leaders: You can rebattle all eight gym leaders from the original Black and White games after you defeat the Elite Four. You'll find them in their respective gyms.
* Elite Four: After defeating the Elite Four once, you can challenge them again by going back to the Pokemon League.
* Champions: Both Alder (from Black and White) and N (from Black and White 2) are available for rematches. You can challenge Alder in the Pokemon League after defeating the Elite Four for the first time. To battle N, you need to complete the entire game, including defeating the Elite Four and Alder.
* Some NPCs: Several trainers you encounter during the story, like Bianca, Cheren, and Hugh, are available for rematches after completing the main story. You can usually find them in their respective locations.
* Many trainers throughout the world: You can find many trainers scattered throughout the Unova region who are willing to battle again.
Things to Note:
* Team and Difficulty: The trainers you rebattle will have a slightly higher level team than the first time you fought them. This makes them a challenging test for your Pokemon.
* Different Locations: Some trainers might be in different locations than where you first encountered them.
* No Story Advancement: Rebattling trainers doesn't progress the story, but it's a great way to earn experience and test your team.
Overall, the ability to rebattle trainers in Pokemon Black and White 2 is a fun and rewarding feature, allowing players to test their skills and challenge themselves after completing the game.