Use Surf on Route 205 and you'll easily find a Tentacool.
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Most Water Pokemon can learn surf in Ruby, like tentacool or wingull.
Tentacool evolves on Lvl. 30 into Tentacruel.
Tentacool evolves at level 30 into Tentacruel.30
I don't think so? Not sure though
You can't get a Tentacruel by just fishing/surfing in Pokemon FireRed. You have to Evolve a Tentacool (It evolves at level 35).