There's nothing blocking you to get into Valor Lakefront. To get into Lake Valor, you must have defeated Gym Leader Bryon and have talked to Prof. Rowan in the Canalave City Library.
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You get the potion from Cynthia at Valor Lakefront. Then go to route 210 where the psyducks are.
Its Girafarig. It can be found on Route 221, or on Valor Lakefront.
you get the white flute by findering the suite key at the valor lakefront
there is no key for valor lake front
if you go to the gateway between the route before pastoria and the route before hearthome (i think, otherwise veilstone) and you use the itemfinder right out of the doorway you will find it