Maybe in V10, Solaris is getting desperate to accelerate his plans and goes to extreme measures by attaching the PULSE to his own Tyranitar, causing Sand Stream to sweep over the region North of Chrysolia. Maybe after Tyranitar is defeated, it dies from a PULSE malfunction and Solaris snaps: pulling out a gun. And when he's about to kill the protagonist, the bullet is stopped by a Gardevoir and a mysterious person shows up (Could be Psychic Leader or Fairy Leader, it would be left ambiguous until Gen 6 Pokemon come out).