To perform this move, hold down the X (Xbox 360)/Square (PS3) button for a short time. Amy will then concentrate an odd pink energy, which starts to envelop her. Once the energy has been focused, several transparent rings move up and down Amy's body, which turn her completely invisible for 15 seconds. While in this state, Amy cannot be seen by the enemy. However, she is not 100% invisible, as her Piko Piko Hammer and shadow can still be seen.
It is unknown why Amy was given this ability in Sonic the Hedgehog (2006). However, it's possible that Amy always possessed this power, but simply never had a chance to use it.