This page offers information on how to obtain the Golden Fishing Rod.
Completing the Fish Critterpedia
To obtain a DIY for the Golden Fishing Rod, you’ll need to complete the fish section of the critterpedia. There are a total of 80 fish to be caught, and fish are seasonal so it will take you a while to obtain all different species if you do not time travel or visit different islands in the opposite hemisphere. Donating the fish is not required to unlock the golden fishing rod DIY, but Blathers will be very grateful if you do donate the first of each fish species you catch! When you’ve caught all the fish, you’ll be sent a DIY in the mail!
Golden Fishing Rod DIY
To craft the Golden Fishing Rod, you need a fishing rod and a golden nugget. The fishing rod required is made from a flimsy fishing rod and an iron nugget, and the flimsy rod is made from 5 branches. Gold Nuggets are obtained from boulders but they are rare and will not spawn that frequently.
The Golden Fishing Rod is far more durable than the other nets in the game, however, it is not indestructable. Other than its increased durability, it does not have any special powers.