you use a super rod at iron island
To Catch A Quilfish,You must Go To Canalave City And Go On The Boat And Set Sail To Iron Island.When You Get There,use your fishing rod and use it in the water.OF COURSE you won't immediately catch it,there will be other Pokemon like Gyarados,Magikarp,etc. HAPPY CATCHING!
In Pokemon Diamond, Pearl and Platinum you can find Quilfish by fishing at Iron Island with the Super Rod. Quilfish has a low spawning rate so you may need to fish for a while to finally find it.
You can obtain QUILFISH but fishing at Iron Island with a Super Rod.
super rod
Magikarp
Old Rod.
a good rod or super rod
No
yes
You can fish with a super rod
You can catch them if you use your old rod in water.
You can catch it almost anywhere, but you need the good rod to catch it.