Shovel Claw

The Shovel Claws are a pair of hooked claws made just for digging. This upgrade is only for Knuckles the Echidna in Sonic Adventure and Sonic Adventure 2. They also appear in Sonic X. Knuckles uses them mostly to dig (but in Sonic X, it has also been used as a form of attack).

In Sonic Adventure, the Shovel Claws are found in a small cave behind Tails' workshop. After getting trapped by a Kiki badnik, Knuckles has to find a switch which destroys the cage the badnik is protected by, which is buried underground. It is a later requirement to find the Master Emerald shards.

In Sonic Adventure 2, Knuckles finds them in Pumkin Hill. And is found near the very start of the level.