PokéBase - Pokémon Q&A
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All the puzzles? New Unowns appear after each solved puzzle, so if you want to complete the Unown Report (or what's it's name), then it's usefull. And, after solving puzzles, new chamber appears behind them (there are 5 puzzles,4 of them has secret chambers, each with 4 items)

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You need Escape Rope, Flash, Water Stone, and Ho-oh to open these rooms up.