I know you've gotten answers over on sppf, and that Impo already said it, but I'll note...This is...not much of a difference, especially as we're talking about Palkia here, the large, legendary Water/Dragon type who controls space. Even if Palkia is unable to use its powers to stop that wave (somehow =/) or ride the wave, or swim through it, etc I don't think it would really do all that much damage.