Originally Posted by Jirachi
Yeah it's both of them but there is a ? mark and you can't see the Pokemon.They reveal Rayquaza and Deoxys.
The question mark you're talking about is at the official website for the movie, in which they don't show what the "surprise" Pokemon is. It's not Deoxys, who is the star of the movie. It can be a new Pokemon, but nothing is confirmed yet, so we just have to wait and see how that turns out.