I thought it was braile, but never confirmed it. I liked the idea of making something of a mental challenge to access the legends. I mean for me, as the son of a woman who hates computers and especially games as she feels that they encourage not stretching your mind and just "sitting there twiddling their thumbs", it was a great power to the "it does actually help you learn stuff" arguament. My only annoyance with it was the need for a Wailord, which I never found on the one route that you can find it wild, and it took more time than I liked to level it up. Good job my friend gave me his emerald which happened to have one, saved a lot of time and frustration ;)