It depends on what game.
In diamond/pearl, you don't need any.
In GB games, I'm pretty sure you only need one, but maybe two depending on the game and if the person you wnat to trade with has the game as well.
Just 2.
There is no emerald to trade between firered and emerald you need wireless adapters.
Simply trade between ruby, sapphire and emerald, remember to trade with emerald you need wireless adapters.
Yes but you also can trade using a GBA to GBA link cable.
The emerald doesn't exist just the ruby and sapphire, to trade with emerald and leafgreen you need two wireless adapters.
If you are asking how to trade between the two games you would need two games and systems(or a friend that has them). You would also need two wireless adapters or a trading cord. Hope I helped.
You need no adapters.
The emerald doesn't exist just the ruby and sapphire, to trade with emerald and leafgreen you need two wireless adapters.
Deliver it to celio and now you can trade with sapphire or ruby version. To trade with emerald you need two wireless adapters. Also after that finish the pokedex oh and try the trainer tower.
You would need to find and install adapters to the hubs.You would need to find and install adapters to the hubs.
The most players you can have on all games on ps2 is 8 but you need certain adapters
Yes.