You can get to Mirage Island but if you do consider yourself very lucky. It only happens
probably once in every game. Mirage Island is out on Route 129-131 im not exactly sure
which or where. Those routes as you probably know are Water routes to the east of
Pacifidlog Town. To find out if Mirage Island is there on that particular day go to
Pacifidlog. Go to the bottom right house. Talk to the man looking out the window. He will
either say "I can't see Mirage Island today..." Or something like "I can see Mirage Island
today!!" (I'm not sure he has never seen it for me.) If he says he can Mirage Island will
be to the east. So explore it fully because that is much more than likely a once in a
gametime chance.