So I have a shaymin and I went to the person in the snowbelle pokecenter, but all she says is "Have you ever heard of the Gracidea Flower? It's been a long standing tradition in the Sinnoh region to give bouquets of them to people as a way of expressing one's appreciation!" Does the shaymin need to have a certain move or something?
>In Pokémon X and Y, Gracideas are featured in one of the paintings on display at the Lumiose Museum. A female NPC located at the Snowbelle City Pokémon Center will share one of her Gracideas with the player if she is shown a Shaymin.
It says "if she is shown a Shaymin" so you need to have it in your party to get the Gracidea Flower.
Hope this helps!