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After catching Calyrex and your version’s steed, bringing them both to the Silent Graveyard will allow you to meet a giant, very silent man. Visiting an old grave, you catch his eye and he mumbles for a battle. After beating his team of lvl 80’s and his unique Floette, you find an item left behind called the Eternal Bud. Taking this to the Castle’s Garden, initiates a hidden scene, where multicolored flower petals start to fall, and suddenly you find a Flabébé with a wilting flower, surrounded by Florges of all five flower varieties.
The Flabébé notices you, and Calyrex escapes from its Pokeball, and urges you to hand the Eternal Bud to the dying fairy type, and upon your act of kindness, the Flabébé evolves into Eternal Floette!