there is more than one, one in vermillion city to the left of the Pokemon center, one in fuschia city to the right of the Pokemon center and to the right of the wardens home, one in the vermillion port area which is to the right of vermillion you go to the right of vermillion then go down until you find a house with a blue roof in there is the last guru.
Chat with our AI personalities
by fishing or using surf
You can't get a Tentacruel by just fishing/surfing in Pokemon FireRed. You have to Evolve a Tentacool (It evolves at level 35).
You can get it in Vermillion City in the house that is next to the Pokemon Center.
in dawns house
old rod is at viridian city top left house good rod fuschia city and super rod on the way to fuchia by the fish ing thing where thers goldeens and stuff.