Nico Robin/History/During and After the Timeskip, One Piece Wiki

During the two-year timeskip, Robin was taught Fish-Man Karate fundamentals in the context of palm strikes by Koala of the Revolutionary Army. Since then, Robin has learned how to incorporate the effects of Fish-Man Karate into her usual fighting style of sprouted limbs, allowing her to break structures with ease through precise palm strikes. Robin returned to Sabaody Archipelago in secret for reasons currently unknown. She had pulled her hair back, revealing more of her forehead and was wearing

One Piece timeskip: In which episode does the timeskip take place?

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What exactly does Nico Robin do for the crew? How does reading Poneglyphs help with Luffy wanting to be the King of Pirates? - Quora

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Usopp/History/During and After the Timeskip, One Piece Wiki