Ok, now i know the origin and story behind the GPS games

I talked to a guy from Spain who sold some GPS game and i thought i'd ask him if he knew what the GPS games were. And luckily he did

The GPS games were released at the end of the NES era. For Spaco (spanish importer of Nintendo stuff) to get a game with ESP code they had to order atleast 5000 copies of one game. Since it was the end of the NES era and sales were going slow it would be very hard to sell 5000 copies of an old NES game, or new for that matter. So Nintendo made a universal code for the games, you guessed it, the GPS code. This is why GPS games have been found in several of countries.
Instead of printing local languages on the box and manual they printed all in english. Then the different importers would just include a manual with their language in additional to the english one. Thats why i.e my copy of Mario & Yoshi GPS have both a fully english manual and a french/dutch manual. Stickers on back of the box was also applied sometimes. Doesnt look too good, but it was cost efficient.
So in short terms, the GPS code was a universal code that was released at the end of the NES era. What GPS stands for is still a mystery tho.
Remember me as the guy who solved the GPS mystery! LOL

But good to finaly know what it is