Because you only have a Japanese machine and want to play a PAL game on it, I guess.
But again, why? If you want to play an english-language game wouldn't NTSC-U games be a much better way to go? IIRC, they, like NTSC-J GC games, support true 480p where PAL games don't.
And not all PAL games were also released in the US, there's at least 15-20 I can think of that were not, or are much cheaper in PAL land by comparison.
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