From Bulbapedia, the community-driven Pokémon encyclopedia.
The new game is called Pokémon Copper. This new version includes 152 new Pokémon to discover, new places, old places, and so much more
- In this game, you are able to not only fly to a different city or town, but once the Elite Four has been defeated and you have obtained the National Pokédex, you can also fly to the previous regions: Kanto, Johto, Hoenn, and Sinnoh, to catch the remaining Pokémon not found on your regional Pokédex.
- New region called Wiltroboh. Here, you may be able to find Pokémon from all the aforementioned regions, plus new ones native to this region.
- The National Pokédex will also receive an upgrade. When you obtain the National Dex, some of the Pokémon's National Dex numbers will seem to be off. The reason being is that so all the evolutionary families (such as Pichu, Pikachu, and Raichu) will be next to one another, and some other adjustments. Here is the list of Pokémon in National Dex order that will be found in this game:
National PokéDex - 001-080 (Bulbasaur-Hitmontop)
National PokéDex - 081-160 (Bellsprout-???)