From Sonic Retro
|Game: Sonic the Hedgehog 2 (16-bit)|
BBat is a badnik which could be found in Hidden Palace Zone, in a beta version of Sonic 2, until that level was ultimately scrapped. This badnik's code was deleted in Sonic the Hedgehog 2 (beta 5), along with Redz.
It waits for Sonic to get closer, and then it attacks by simply following an U-shaped pattern, ideally hitting Sonic at the lowest point of the arc.
It also looks like it was meant to use Sonic's Palette as in game it looks off.
|Sonic the Hedgehog 2 (16-bit)|