Jolteonsky

Hi! I cannot make the Mirage Tower to appear and i don't know if there is a previous requirement to do that (i checked the bulbapedia and pokemmo wiki and there is no requirement mentioned). I tried everything: reloading the map going to PC, going in and out to secret base, getting to another route, logging in and out and nothing. I tried that all hundred of times but not results... Any idea of what is happenning?