pokemon fanfiction tough birth one part story

ash was occasionally having weird dreams about when he was little including a strange girl and him being sick for a while he asks his mum if there is anything to this and she says to head to the tin tower and hunt for a girl called liana on arrival ho-oh appears for a second which drops a rainbow wing than disappears then a girl who is clearly liana says happy birthday to ash and says its time for him to be healed and explains that she is his sister but had to be apart to protect their powers that are designed to help ho-oh as they are part ho-oh supprising ash but understands.