The first-party fighting game it seems Sony is almost certainly working on doesn’t have a proper name beyond a working title of “Title Fight”. Most people just call it “that Sony Smash Bros. game”, since in concept it sounds almost identical to Nintendo’s famous brawling franchise.
https://lastchance.cc/is-sony-working-on-its-own-smash-bros-game-5862755%3C/a%3E%3C/p%3E
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First revealed last year, the title – in development at SuperBot Entertainment – is supposedly a fighting game which features, among others, Nathan Drake, Twisted Metal’s Sweet Tooth, Killzone’s Colonel Radec, Fat Princess, Kratos, Sly Cooper and even Parappa the Rappa.
Rumor: Sony Super Smash Bros Game to be Titled “PlayStation All-Stars Battle Royale” [PSLS]