[Meta thread] Lord Windos' PokeRole Adventure : Celadon City Vandels

[Dragonstrike]

Mirror Shot from Magneton then? He can learn too according to the Core Book. Or maybe Metal Sound/Screech to reduce the Special Defenses and Physical Defenses of Necrozma.

I'm honestly not entirely sure why the heck Mirror Shot inflicts Confusion in Pokerole when it lowers accuracy in the games, tbh.  Either way, though, lowering accuracy via a stat debuff or Confusion is going to be helpful (and Flash Cannon and Mirror Shot produce/utilize light, so that weather effect might alter their effects drastically...)

So long as Necrozma is vulnerable to stat reductions, then Metal Sound/Screech should work just fine (you'll only have to use one of them, though, since the Defenses are merged in this campaign. If you use them at all, that is)