I've been doing some research on my own and I've learned that Language isn't only thing that's different in the Japanese version, you may be giving up allot more on the technical side of the equation!!
BUYER BEWARE
you see, even though all Nintendo DS systems are technically the same, there Is a massive hidden difference that will defiantly keep you off the Wi-Fi, and could possibly mess Up your system!!
you see, here in America, the Wi-Fi infrastructure we use consists of IEEE 802.11 A, B, G, and most recently N, all operate on the 2.4 Gigahertz frequency.
now Zoom out for a second and take a look at Japan,
In Japan, there is often a lack of space in crowded cities like Tokyo and Osaka, but the buildings aren't the only thing that's crowded, if you look at the full spectrum you notice Radio Frequencies are crowded there too...
Over there, 2.4Ghz is reserved for Police and Emergency Services use (though it's been phased out recently for distance reasons), and transmitting on that frequency without a permit can result in a fine.
So to compensate, Japanese Wi-Fi Has been moved to IEEE 802.11 J on 5.4Ghz.
so though the DS system is technically the same worldwide, the Japanese Platinum game card will contain wi-fi configuration exclusive to 802.11 J, with a few compatibility workarounds, but even if you do succeed in connecting to a Uniband router, the thing will just get confused when you tell it where you live, as there is no Princeton or even a West Virginia in Japan...
I have confirmed this with the Japanese Sales engineer of my dad's company [thank you Matthew-san!] , the workarounds aren't pretty and could cause damage to both you DS and your Router, but If you must- set your router to operate at 1.5-2.0Mbps 802.11 B/A, Channel 6 and hope for the best.
So please, I know It's hard, but could you PLEASE be just a little patient and wait till the English release in April 09'. only then will It be fully articulated and ready to run (and you wont have to learn Katakana just to enter your name).
In the meantime, the New Ranger game's set to come out in two month's (November 10th)!!
Ok can any one tell me if there is any truth to this??