The Old Rod no longer fishes just Magikarp the majority of areas early on in the game relinquish valuable water Pokemon when fished into with the Old Rod. Small patches of grass have been added to Viridian, Vermilion, Celadon and Cerulean with new Pokemon inside. The Super Rod has not changed locations. The Good Rod is now located in Vermilion, where the Old Rod used to be. The Old Rod is now located in Viridian, north of the coffee guy. The majority of fishing and Surfing locations have had their Wild encounters edited to fit with the change in rods and allow a wider variety. The majority of VS Seeker battles have been left untouched. All Wild Pokemon in Grass, on cave floors etc and first time trainer battles have been changed. The starters are now Smoochum, Elekid & Magby. I figure you could all make good use of it. This document came with my copy of Pokemon Fire Red Omega when I downloaded it, and it's quite useful.
