If you are playing Pokémon Black, you can access Black City after beating the game. The amount of time that it took you to reach Black City affects how many people there are in the city. The number of people in Black City will affect what items are available for sale in the market. More people in the city will cause rare items to show up for sale. Up to 12 of the people in the city will be trainers that you can fight once a day.
Residents of Black City
To add residents to Black City, you must visit White Forest in another player's game via the Entralink.
The NPCs of Black City will only stick around if you visit and battle them. They each have a secret point value, and if that value reaches 0, that NPC will leave. Each time you go into Black City, you increase all the NPCs' points by 3. Each time you battle an NPC, his/her points go up by 10.
Black City Market
The items available in the market depend on how many NPCs there are in town. You can get 10,000 Pokédollars for every 10 trainers you defeat in the city.
Black City Market Items
- Fresh Water - 1000 Pokédollars
- Berry Juice - 1500 Pokédollars
- Yellow Shard - 3000 Pokédollars
- Green Shard - 3000 Pokédollars
- Blue Shard - 3000 Pokédollars
- Red Shard - 3000 Pokédollars
- Tiny Mushroom - 3000 Pokédollars
- Max Repel - 5000 Pokédollars
- Pearl - 6000 Pokédollars
- Dawn Stone - 10000 Pokédollars
- Sun Stone - 10000 Pokédollars
- Shiny Stone - 10000 Pokédollars
- Leaf Stone - 10000 Pokédollars
- Water Stone - 10000 Pokédollars
- Fire Stone - 10000 Pokédollars
- Oval Stone - 10000 Pokédollars
- Thunderstone - 10000 Pokédollars
- Dusk Stone - 10000 Pokédollars
- Moon Stone - 10000 Pokédollars
- Poké Ball - 10000 Pokédollars
- Stardust - 10000 Pokédollars
- Heart Scale - 10000 Pokédollars
- Fluffy Tail - 15000 Pokédollars
- Poké Doll - 18000 Pokédollars
- Big Mushroom - 20000 Pokédollars
- Rare Bone - 30000 Pokédollars
- Big Pearl - 38000 Pokédollars
- Star Piece - 48000 Pokédollars
- Nugget - 50000 Pokédollars
- Luxury Ball - 50000 Pokédollars