Steps:
Go to the boy outside of Dewford hall.
Start a new trendy saying: "NOSEPASS SIMPLE".
Go to the river southwest of Fortree.
Go up until you reach the waterfall. DO NOT GO UP THE WATERFALL!
See those two pieces of land? The Feebas hole is two blocks below that!
Enjoy fishing!
Note: Other Pokemon are also found on this block.
Go to the boy outside of Dewford hall.
Start a new trendy saying: "NOSEPASS SIMPLE".
Go to the river southwest of Fortree.
Go up until you reach the waterfall. DO NOT GO UP THE WATERFALL!
See those two pieces of land? The Feebas hole is two blocks below that!
Enjoy fishing!
Note: Other Pokemon are also found on this block.