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You have to beat the Pokemon League.
no she doesnt
In the concert hall to the left
there is the place that records your Pokemon for the hall of fame
You can find Fantina outside the door in the contest hall.
in harthome city its the circle building to the left of the gym
she is on the contest hall in Hearthome City.
hall of origins
sadly, there isn't one. Only in diamond and pearl.
At the Hall of Orgin in the Spear Pillar. You will need to get a flute from the Mystery Gift.
Yes there is new moon island, hall of origin.
In sootopolis.