... If somehow the argument is that Giratina Seal's Sora and/or just wait's out for a gazillion years, I heavily doubt that will work seeing that Sora can Unseal any lock/negate sealing, and that under SBA...
"Victory Conditions: Death of the opponent, removing the opponent from the battlefield for at least one week (
BFR), knocking the opponent out for at least one hour, or incapacitating the opponent by putting him in a state in which he can not harm the other fighter(s) for over a day, are to be assumed as victory conditions.
State of mind: In character, but will attempt to win the battle. Characters will not give up of their own accord. That means a character that is uninterested or sees no chance of winning won't simply leave and characters wouldn't simply become friends with each other. This doesn't prevent a character being made to give up, because the other character manipulates them via things like, for example, mind control, fear inducement, psychological tricks or superhuman charisma.
Each character will view their opponents as enemies, who they have to assume wish to cause them severe harm such that losing could have any range of dire consequences. The characters will assume their opponents have not been forced into battle. They are assumed to have decided from free will to fight and are not excused by a just cause, difficult times or otherwise exonerating circumstances. Furthermore, the situation is assumed one where the opponents are not protected by social norms or consequences, such as being a civilian protected by law."
This implies that, A, Giratina see's the opponent as a threat that can inflict harm to it, and B, if Giratina tries to hide in the Distortion World from Sora for over a week (Even though we can infer that the character in question wouldn't likely remove themself from the battlefield as they made explicitly obvious note's to prevent character mindset's that would lend themselves to this.), that can count as self BFR and grant Sora a victory.
Giratina will attempt to win the battle, and in character, it is often seen trying to attack with it's raw force against individual's that challenge it: Every time it is met as a Catchable Legend for example, minus the DW battle in Platinum, it can easily escape into the Distortion World, but instead chooses to Violently lash out at it's foe. The likelihood it attempts to simply out wait Sora is extremely low, and a easy argument for this going against the entire premise of having the character's duking out can be made should it be decided that it would choose this path for some reason.
In fact, the only time I can recall it BFRing someone is against Cyrus, in a extremely specific situation where trying to battle him would likely take too long as Dialga and Palkia were going to be used to rewrite the Verse. There may be some other instance I'm not thinking of, but the point is, it is extremely likely Giratina begins by simply trying to attack Sora with it's Ghost Type Attack's, or other Attack's it is known to use in encounter's against it.
Edit: I am not trying to say that Giratina is inherently a Violent and/or Bad individual by this, if that is something you wonder. I am simply saying that when pushed into a corner, it's first choice tends to be to assault the foe before it rather than to slink away or start abusing it's Hax, barring extraordinary circumstances.
