Dark Chao Walker

The Dark Chao Walker is a huge robot piloted by a Dark Chao that appears exclusively in Sonic Adventure 2: Battle.

Description
It was meant to replace the multiplayer appearance of Big the Cat (as Nintendo players would be unfamiliar with the cameo at the time of the game's release). It mentors all abilities of heavy fighting robots. The robot was made by Dr. Eggman for the Dark Chao in order to copy the creation of Tails'Chao Walker. This machine can only be used in the multiplayer mode shooting game.

In Battle
In battle, the Dark Chao Walker is the most powerful. It has the highest attack power and highest defense level. But this comes at a price as it is also the slowest and requires more Rings for special attacks, 30 then 60 then 90.

Its special attacks have the longest effects though, it shoots an extra round of Homing Missiles, an extra round of Rocket Launchers, and its Laser Blaster lasts roughly 50% longer.