you trade with your friends and your friends must be in front of you
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yes if u have a Pokemon pearl or diamond trade the Pokemon from the palpark then get another ds put pearl or diamond in then the platinum in the other ds and trade at the Pokemon center at the top
If you're using a DS, you can do Wireless Trade Local or WiFi. But if you're using a Gameboy, you can't trade without a trade cable.
yes You can trade Pokemon from another ds from 20M away The Pokemon game in the other ds has to be the same generation as yours You can't trade with a gameboy SP games ( Ruby Sapphire Emerald) Nds Pokemon games are: Heartgold Soulsilver Platinum Diamond Pearl
Yes using the Wireless connection for the DS or Nintendo wifi connection.
No you do not need wifi to go into the underground tunnles but you can use ds to ds action and play with your friends in the underground and trade and stuff.