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Seasons were intended to change not only the region, but several different Pokémon. A Pokemon could have a form you could only encounter during a specific season. The exterior of certain buildings would also change depending on day or night.
Infrared technology was implemented to keep people from hacking and making roms out of the game
The GTS PC Club (Global Link) was a PC extension of the games where people can trade, battle, create avatars, and send MP3 data to the DS in order to listen to your own music while riding the bike.
