In Pokemon how do you catch a finneon?

Uncommon in Routes 205-South, 218, 219, 220 & 221, Fuego Ironworks, Iron Mountain, Canalave City, Valley Windworks (Fish w/ Good Rod)

For more info go to serebii.net Good Rod Level 10-25 Canalave City Valley Windworks Fuego Ironworks Iron Island Route 205 Route 218 Route 219 Route 221 Route 220