When you want to lvl up a pokemon with lvl 25 or less with Zedja or Shadowstorm code, make sure you have plenty of potions or berries, cuzz the first battle against Zedja or Shadowstorm with a 25 lvl or less pokemon might be long. Also i recommend Shadowstorm code better than zedja. And if you have a physic pokemon and want to lvl up with Zedja or Shadowstorm code, be sure to type well Physic. In Shadowstorm code, physic is typed "phycic" and in zedja it is typed "physic" . If training physic, then use Shadowstorm code, believe me, you won't like zedja code 4 physic.