Just gonna restate my point that Nintendo never intended for it to be released, nor would it have been known about if the cart was not leaked (even for the date info). If Nintendo never intended for it to be obtained (with the new distro cart), it shouldn't be legitimate. At best it should be 'semi-legitimate' like the Azure Flute Arceus.
This definition has been the standard for liek, ever. According to the great Tsanth:
'Legal' has been split into two (more refined) sections, with Semi-Legit taking up the 'shortcuts' region and is thus more pure than Legal. Changing the distro DS date is definitely a shortcut. Sure this card can exist, just like an Azure Flute Arceus. If you or someone(thing) else outsteps the bounds to get you something that would never be normally obtainable, it's not 'legit'.
As a humorous aside, Darksteal co. says the Celebi's were not officially distributed ==> Not legit! (lulz)
Other (sets of) people chiming in: we are pretty pro-hack here, so our own definitions may be skewed compared to everyone else
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Flame away