Sonic's Secrets: Barkley Shut Up & Jam! 2.
All the following Secrets work in EXIBITION mode.

Press START to pause the game and Highlight QUIT (See Below) then press the following:
All Barkley Team. B 3 times.
Mirror Match. C 3 times.
Play as Barkley's teammates:
Blade. A 3 times
Dolemite. A 4 times
Hamma. A 5 times
Jim-Pak. A 6 times
Pauly. A 7 times
Shuga. A 8 times
Spider. A 9 times
Bongo. A 10 times
Then select RESUME and press START to activate your chosen team.