>>47471719>>47471891The game manual, something that every kid at the time read through a billion times because of how colorful and useful it was, had the braille alphabet in it.
When reaching the braille walls, it'd be impossible not to go "Hey, it's the stuff in the manual!" and get that it was a coded message.
And considering that the wall literally tells you, as straight as possible "Have Relicanth and Wailord in your team in this order", it wasn't exactly impossible.
It was just a puzzle.