User blog:John Litschauer/Wally West THE FLASH...ALIAS: SUPERSONIC

In what issue/title did Wally West/The Flash III take the alias: Supersonic? and why? In the storyline he dressed in a "new" black costume,similar to the black costume he wore while in the JLA Elite. I don't know where to get this info, so I need the help from true Flash Fans. Thanks.