From Sonic Retro
The Bounce Bracelet is an upgrade available to Sonic in Sonic Adventure 2. They enable the blue blur to use the Bounce Attack move, an ability that serves as not only an attack, but also as a means reaching higher places that were otherwise unreachable. In other games (like Sonic Advance 2), Sonic has the ability by default, and therefore does not need any type of upgrade for it.
Sonic Adventure 2
- Purpose: Allows Sonic to use Bounce Attack. It comes in useful both as an attack and getting to high places.
- Location: Pyramid Cave. Right after the second Point Marker, stay along the path until you come across the Bounce Bracelet.
- Requirements: None.
- Required For: The final missions of Green Forest and Crazy Gadget. Everything that nominally asks for a bounce in story mode can be circumvented, but there are places in Pyramid Cave and Final Rush where it's far more convenient to have it.
- Equivalent: None.