Gear Part, see Invisible.
Amy can temporarily turn invisible and sneak past enemies. However, she still takes damage if she’s struck by a projectile
Sonic the Hedgehog: Official Game Guide 
Invisibility is a special move used by Amy Rose in . By concentrating her energy, Amy can turn herself completely invisible.
Sonic the Hedgehog (2006)
When using Invisibility, Amy concentrates a pink energy, which starts to envelop her. Once the energy has been focused, several transparent rings move up and down her body, which turns her completely invisible for fifteen seconds.
While using invisible in gameplay, Amy cannot be detected by enemies, though she can still take damage. To perform this move in gameplay, the player must hold down
/ for a short time.
Despite becoming invisible with this move, Amy's Piko Piko Hammer and shadow can still be seen.
If Amy is walking on the ground when the invisibility wears off, she will stop and look over herself.
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.
Because of this power, Amy is one of the few characters in the Sonic series to turn invisible, an example is Espio the Chameleon, who can use this power in various games.
Sonic the Hedgehog: Official Game Guide, pg. 17
Sonic the Hedgehog (2006)
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