Which Pokemon game was leaked the earliest relative to the release date of the game?

Question

I mean with actual footage/images that proved to be true.

Comments

of gen 4 remakes?
if no then red/green.if yes bdsp.

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Any game

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By leaks do you mean leaks of the physical game itself or information of the game being released?

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Real or factual images or details of the game.

Answer 1

Apparently, Pokemon Sun and Moon were found as newly copyrighted trademarks on the website of the EU's Intellectual Property Office on February 25th, 2016, the day before the Pokemon Direct that would announce the game. This seems to be the only time a game was leaked before it was announced.

Source

Of course, apparently the entire source code of ZA and possibly parts of Gen 10 were acquired through the Teraleak last October, however they were not leaked to the public for "ethical reasons" lol.

Comments

You'd have to do more of your own research, but registering a trademark doesn't necessarily mean something. If my memory is correct, Pokemon Gray was/is also a registered trademark, one registered for the purpose of simply preventing anyone else from using it. Just thought it may be worth bringing up here, though if this is the only instance where it happened, this is obviously the closest it's ever gotten to a leak before announcement.