Dream Mist
From Bulbapedia, the community-driven Pokémon encyclopedia.
Dream smoke is an quest item to unlock the C-Gear in Pokemon White/Black. After you have saved a baby Munna from Team Plasma in Sanyou City, an adult Musharna comes to pick up the baby, leaving the Dream Smoke behind. Makomo will grab the Dream Smoke and reward the player with the C-Gear.
