Black City & White Forest both focus on the technology versus nature aspect of the games. As such, Pokémon Black has numerous trainers with fully evolved Pokémon while Pokémon White has their base form as wild in Level 5. When you get to the area, you will notice you only have ccess to a certain amount of these. The Pokémon you will find will change when you encounter others using the Entralink feature within the games. The Pokémon you encounter in these areas is set by your game randomly when you begin.
Over time, if you fiddle with the clock too much, the areas will become deserted with no buildings and trainers in Black City and no grass in White Forest. To fix this, you'll need to go into Entralink with your friends and try and get people to come to your areas. This can only be done between Black City & White Forest. You will not be able to get other trainers to go from two White Forests or two Black Cities. You can only have up to 10 characters in your area at any one time
Pokémon, Trainers & Items
The characters within the area completely control the Pokémon and items you will encounter within the area. This allows for every experience to be different. In order to change the Pokémon and/or trainers you encounter, you need to connect to Entralink with a friend. Once you have done this, interact with the trainers in Black City or the characters in White Forest while in the Entralink and they will begin migrating into your version. If you go to Black City through Entralink while playing White, the base form Pokémon of the trainers you speak to will appear in White Forest and if you go to White Forest while playing Pokémon Black, the wild Pokémon you encounter in the game will cause the trainer with the fully evolved forms to appear in your game.
Finally, there are also several trainers in both Black City & White Forest. You can only battle these trainers once but they showcase the Rotational Battles in Black and Triple Battles in White. They are as follows;
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