Just like the title says, I want to create a fighting simulator game with EA UFC 3 as the base. But how would I go about of extracting or recreating the moves/fighting techniques from the game? It's not on pc, I have it on console digital.

I don't care about assets or graphics; I just want the fighting animations.

How to do that?

Well, the first step would be actually getting the files onto your PC for analysis. Do you have a jailbroken PS4? If not, you could try downloading the game from somewhere, though the forum rules likely don't allow explaining the specifics. There are tools on GitHub for extracting PS4 PKG roms.