From what i read Kingdome Come Flash, that his Wally West like the classic Flash was the greatest speedster ever been in DC Universe, but if classic Wally West his nearly a master of the Speed Force and more linked to it than any speedster, KC Flash is the Speed God on hiw own, he was so fast the only Supes could understand him if he speaks, he was able to be in multiple locations at the same time, and it means he can be in differents parallel dimensions and in the KC Dimensions simultaneously, and has total mastery over SF, he was also able to fly if i'm not wrong through total control over his molecular structure, so i think that is hard to defeat him, but godly characters like the Living Tribunal, Beyonder or any warp reality able character must not be in VS threads, how can you put a hero or villain against someone that can simple blink and eye or snap fingers and make him doesn't exsist?
flash was everywhere & nowhere / moving between time, space, energy loosing mass & gaining energy & heat & friction & covering miles of " square feet in seconds " I don't even like DC that much , but I gotta say that was impressive Vulgar display of power.
now you are playing with poWER. flash is hard to top in this case. he sould get like a YuGioh card or something.......
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New Son
New Son had control of kinetic energy at a submolecular level. He could turn an object's potential energy into kinetic energy, making it explosive. He does not need to make physical contact to do so, nor does he have a block to prevent him from using this on a living being.
He can cause another being to be unable to move or unable to stop if in motion. He was able to cause or simulate various energies by manipulating the kinetic energy present, such as infrared and microwaves by increasing molecular agitation, or cold by reducing it.
Lastly he could transform himself into an energy wave to travel through space and into other dimensions.