Just because a character possesses power, doesn't mean they're undefeatable. Phoenix pretty much only has a moderate chance of winning. That chance is determined by the fact that a character with the right move or skill (like preying on her naive desire to experience everything) may be defeated by another character who doesn't have the right move or skill to defeat Phoenix.
Everyone has a weakness. The only way to ascertain a fool-proof bet is to put God in as a contestant. But that would never happen because as Void has mentioned several times before "we don't know the absolute extent of his powers."




