Memento causes the user to faint, and in return lowers the Attack and Special Attack stat of the target by two stages each. The user will not faint if Memento fails, such as when blocked by Protect or Substitute, but will faint even if the target does not have its stats lowered, such as if the target has the ability Clear Body or is protected by Mist.
The user faints when using this move. In return, it harshly lowers the target's Attack and Sp. Atk.