Underwater Metroid
If you go to World 4-3 (Amiss Abyss) you will be able to find a hidden Metroid in the background just before the underwater signpost with the green arrow. To reach the underwater Metroid you have to swim past the signpost and go all the way out of the cave to the open area where the jellyfish are circling and then backtrack to the cave. On the way back to the signpost you will have to take a hit from the electric seaweed but once you manage to reach it a school of fish will swim up in the background which will be followed by the Metroid.
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