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To open the chamber of the fayth you need a Blossom Crown and a Flower Sceptre, one of which is obtained by defeating Belgemine's Bahamut at REmiem Temple and the other is obtained by catching at least one of every monster found in the Mt. Gagazet section of the Monster Arena.
Then simply enter the Chamber of the Fayth to collect your prize.
You don't need Yuna's celestial weapon or her crest but you do need the Magus Sisters aeon to obtain her sigil
yuna's crest and sigil for her celestial weapon, and i think you need her celstial weapon, or do you get that after. anyways, then remium temple is the place to head on a chocobo at the start of the calm lands.