Prior to [[Generation IV]] (Nintendo DS), trading required a Game Boy link cable, or a [[GBA Wireless Adapter]] (Generation III). Although the Nintendo DS supports [[Generation III]] (GBA) games, it cannot be used to trade between those games as the DS lacks hardware support for the link cable.
The [[Pal Park]] feature of [[Generation IV]] games uses the GBA slot of the Nintendo DS, so unlike other trading requires only one game console. However, it is not compatible with the [[Nintendo DSi]] or upcoming [[Nintendo DSi XL|DSi XL]], which
does not have a GBA slot.
== Requirements for trading ==