I would gladly eat my words at a shadow reveal. More than gladly come to you for your celebratory dance too bc youd earn it. Also I dont think sonic takes anything directly from Fighters. But I do know in PM they gave sonic 2 moves right from battle. To my knowledge there arent any moves from fighters that have a striking pose like battle.
-Sonic's Forward smash is from Fighters (even with the Same Charging Animation)
-There's also his Jab Combo too, and that's also related to Virtua fighter, because Fighters had the same Punch Punch Kick Combo from those games
-Side Tilt
-Down Tilt (though it's not exact)
-Up Tilt (also not Exact)
-Down Throw
-Forward Aerial
I Also believe Sonic's Old Down Smash from Brawl, and His Old Dash attack from Brawl and Smash 4 were from Fighters
In Contrast, the only move that looks like that could come from Battle is his Down Air. His Down Air is more Similar to Shadow's Though since the Move sonic did never dived toward the Ground
That's why, With the Exception of Homing Attack and his Design elements, Sonic in Smash is based of the Classic Version in Terms of Moveset and Animations.
Shadow would actually Contrast Sonic while still being Very Unique by being more based of the Modern Games, So Moves like Boost, Black tornado, Light Speed dash that Sonic doesn't do in Smash could be Represented with Shadow, and Shadow could take moveset elements from Battle to Contrast Sonic taking from Fighters. This would also be in addition to the Mechanics that Chaos Powers could provide with Space and Time Manipulation