Doubling Your Magic Meter
That Big Octo is found in the Two Eye Reef, southwest of the reef, where the flock of seagulls are...
P.S. Use your Boomerang on the Big Octo.
P.P.S. There is an Octo Chart that tells you where all of the Big Octos are; go to the Six Eye Reef, destroy/bomb all of the cannons and ships there and get Treasure Chart #26. Go to North Triangle Island and use the Treasure Chart to get the Octo Chart!
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