the dream world is where you can get pokemon from different generations.
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You will need to trade it from Pokemon White. Or you can get it at Spooky Manor in the Dream World (Over 10,000 dream points).
Lopunny cannot be found in Dream world, but Buneary can-In the pleasant Forest after earning at least 7500 dream points
You can't get it in Pokemon Black. Use PokeTransfer or Dream World.
PokeTransfer or Dream World
Dream world or Route 9 (Swarm)