How much yen is equal to RMB? To download the pocket monster Black 2, see thousands of yen in Baidu Encyclopedia, what is the replacement to the RMB, others

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How much yen is equal to RMB? To download the pocket monster Black 2, see thousands of yen in Baidu Encyclopedia, how much is the other NDS games, how much is the download of other NDS games? Is it free to download all games in TGBUS?