Aegis

Aegis (Japanese: イージス Aegis) is a non-damaging Ghost-type move introduced in Generation V. It is the signature move of Shedinja and Gencullow.

Effect
Aegis halves the accuracy of damaging moves that whose type is super-effective against the user's type combination that target the user for five turns. Moves that deal typeless damage (such as Future Sight) will still have their accuracy halved if the user is weak to those types. Moves that bypass the Wonder Guard or Curse Guard ability (such as Beat Up), will fail.