Trading Trading is one way that you can complete the Pokedex. you can also use trading to get other pokemon that you just want like legendary or just really cool pokemon.
How to Trade There are many ways to trade 1. you can go to a pokemon center and go to the trade place and trade via two people or
2. you can go to the world trade center in Jubilife City and trade with people around the world. ( this is only in the diamond, pearl, and platinum).