Edward Clariss was the rival to Wally West in the Flashpoint timeline Barry created once he saved his mother from being killed by the Reverse-Flash. Clariss was a manic, power hungry speedster that wanted to be bad just for the hell of it.
Unfortunately, though, his comic book
counterpart was far more deadly than he was. Clariss was almost a match for Wally in this alternate timeline and Wally was very new as a speedster and as a superhero, meaning he was nowhere near as fast as he became in the main timeline. On top of that, after Clariss took Wally down with a sneak attack, Barry was able to defeat him with little effort; don’t forget that this version of Barry was losing his powers because of the effects of the Flashpoint timeline.