Unlock spell Immobulus
You can unlock this Spell if you enter the code "AAAAAA" in Diagon Alley at the Weasleys joke shop.
Immobulus and miss love good skin
UD3S3F - this unlocks immobulus spell
2S7TAB - this unlocks miss love good skin
these codes also work for the DS and 3ds version of the game
After unlocking the Imperius ability, go to an episode with a lot of enimies. Now go to one enemy, and shoot them with Imperius. The enemy will start attacking the other enemies. To try this, I used the Year 6 chapter 4 level.