Opponent's Pokemon's sprites change to my Pokemon's sprite when my Pokemon mega-evolves or changes forme (as with Aegislash, or Groudon/Kyogre taking primal forms) This happens every single time. The effect is permanent and lasts until end of battle (or said Pokemon faints) Here opponent's Yvetal sprite turned into Mega-Gengar's on the turn my Gengar mega-evolved. This effect also happens the other way, ie my Pokemon's sprites change when opponent's Pokemon mega evolve. Here my Ferrothorn's sprite turns into Mega-Venusaur's... This started happening after I updated to version 2.6.2 (Android)