Luna Lovegood can see the future.

[vmonte]

No: HPFGUIDX 87269

Mandy:
Very interesting and it occurred to me while reading your post that 
another reason she may not to tell anyone is because of the way 
Seers and practioners of Divination are treated in the WW.  Only 
those of exceptional ability and have been able to prove that ability 
are treated with any kind of respect.  I'm sure that if the teenage  
daughter of the publisher of the Quibbler started to claim she 
could see the future, she would be laughed out of the room.  

spangb:
Well, Luna also believes in a  lot of tosh nobody else would. Like 
those crumplehorned thingies and heliopaths etc. So if she is a seer 
we'd have to accept all those things also. And if she starts seing 
future and knows it, I think it would not have been concealed or 
hidden from others. Thats exactly the kind of thing that Quibbler 
would go for. She would have been ardently admired by her mag's loyal 
readership... 

vmonte:
Maybe being a flake comes with the territory of a Seer! Your response 
is something Hermione would say. Which reminds me that Hermione also 
thought that Trelawny was a flake/fake and it just so happens that 
Trelawny is responsible for the prophesy. (In fact, Hermione reacts 
to Luna and Trelawny in much the same way.) I think Mandy makes some 
excellent points about the way Seers are treated in general. People 
who can see the future may not have complete control of their gift.
Maybe all Seers are a little LOONEY (or become looney)! For example-
What would it be like to know that your mother is going to die and 
not be able to stop it? I think the Quibbler is a metaphor for Luna. 
Among the sensational/ludicrous stories, is truth.  Remember this 
headline: Sirius Black -- Black As He's Painted? Notorious Mass 
Murder OR Innocent Singing Sensation? The first two paragraphs of the 
article state that Sirius is not guilty of mass murder and that he 
may not even have been present at the killings--the rest of the 
article is typical tabloid stuff. 
 It is possible that only bits and pieces of information are received 
by the Seer. Again, being a nut may be part of the territory! I love 
Luna's character--I think she is incredibly interesting.