Your Fighting Quote.

[realizecoss]

"You lose if you fail to win!"
(its a 'people die if they were killed reference)

[Random Brawler]

"You have insurance right?"
"You ruined my shirt. I hope you can afford a new one."
"My lawyers are prepared for everything"

[Gomamon]

"You must eat potato to stand a chance!"

[AGenericDude]

"Real men doesn't think on what happens if they lose." Domon Kasshu

[Reinao37]

Somebody Stop me!

[theiconicrain]

Im Here lets get Real!

[MrRad]

(Intro) "You made the Rad mad!"
(Super move start) "Can I interest you in a lesson of being Rad?"
(Super move end on hit) "A Radical experience, right?"
(Super move end on miss / block) "Should've taken the lesson."
(Victory) "Weren't you a bigshot a moment ago? What happened?"

[Akumisk]

"You should learn your limits, Ya'know?"

[wicloud]

Battle Begins: Time to ignite this Fight!
*level 3 hyper on hit* It may look neat but it's just the heat!
*level 3 hyper miss* Well...aren't you cool?
Victory: Until next time!

[Ⓡⓨⓞⓚⓞ]

I have a few of my own.
"Beat it! You don't have what it takes to win."
"Begone! I don't have time for losers."
"You must first defeat my sister to stand a chance, and I don't see that as happening."
"Why are you crying? Go train harder and try again, maybe next time there'll be no tears."

[xWagnerPlaguesx]

"The Dream Is Dead."
"The Nightmare Has Only Begun."
"You think you can hunt me down? Well you’re dealing with the devil."

[Ⓡⓨⓞⓚⓞ]

So I just noticed it wasn't just for victory quotes but also intro and during fight.

Intro quote: "Hope you are ready for me, punch bag."
Taking a few hits from opponent: "Much less damage than I thought. "
Victory: "The V is still mine, it seems."

[Palette]

"Mines are bigger than yours."

[AGenericDude]

Because i didn't pay attention when i posted my answer (I thought it was a fighting quote from... I dunno, games, tv shows, comics...), i'm gonna try again.

Intro: "Talking time is over, let's play!"
Win: "Does this GG stands for 'good game' or 'get good'? You decide!"
Lose: "I blame RNG for this."

[syfty]

"The dust on my feet deserve more attention than you"

[Ahjeji]

"..." - Kung Fu Man

[Foxyall]

"..." - Kung Fu Man

He says "TAH" and my favorite, "HUUuwwWAAAAAUUuuuWWAAAAuuuuwaaaauuuuwwwaa"

[Megaiwer]

"Wait... I'm still alive?"

[rounddaway]

"what sick man sends babies to fight me ?"

[Apollo]

"Have you formulated your strategy to beat me?"

- - - Updated - - -

"This is the stance" - Hit 2018