In 14 easy steps:

Quote Originally Posted by Not so much reliable FAQ
(SPOILER)-------------------
Fisherman's Horizon
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-Go down every ladder until you meet the fisherman
-Talk to him
-Go back up the ladder and go right
-Go down the elevator
-Go down the walkway in the middle of the satellite dish
-Go into the building and upstairs
-Talk to the mayor
-Go back up the walkway
-Follow the mayor
-Help the mayor
-Use Thunder on the boss
-Go along the railroad tracks and enter Grease Monkey's
-Talk to everyone in the town
-Go back to the garden after Irvine tells you to
-Go to the quad to find Selphie
That should do it.