David
The shell hit Leon's character because he wasn't expecting for Cynthia to parry it! To parry in the Ultimate game, she had to click a shoulder button quick and then release just in time. Of course the Sinnoh champion is able to learn something fast just from watching! And that's not all. ROB's Robo Beam shot out for him and Captain took that damage. Since he wasn't so high percentage, Leon is able to take that all before going for a Falcon Kick, his down-B! It rushed toward Cynthia's character who's already so close.
Vincent
The button mashing began once more as Cynthia saw Leon perform the Down-B attack. She could have easily ran away from him by controlling ROB with her joy-cons but in the heat of the moment, she panicked. This caused her to press the right shoulder bottom, activating the defensive bubble! The Falcon Kick bounced off of ROB's body, doing absolutely no damage. Right after the defensive bubble wore off, she whipped out the signature spinning beyblade move, wanting to deal as much damage as possible to the Leon's character.
David
Captain got hit by that, flinching back and then falling just over the side of the stage. Luckily, the character hung on and scrambled back on stage, hitting first. Leon wasn't expecting this to be such a tussle. Cynthia's button mashing is actually saving her butt. Or, she could be a natural. He'll just have to wait and see!
**...**
... So what seems like a while because well, somehow ROB's moves keep prioritizing over Captain's. Eventually both are at the last stock, high damage. Leon only got down to here because items. Otherwise he wouldn't be so near losing against a total newbie! Being careful, the Galarian moves his character around on the platforms, worried that Cynthia's ROB would lob another item at him or blast a Robo Beam. Just as he landed, a Bomb-omb appeared at his character's feet! He picks it up and pivots the Captain around, throwing it. He hopes that the explosion would at least shield poke ROB and send that metal box out of the arena. But.

Just in time, a Smart Bomb spawned between the both of them, in the air and the Bomb-omb crashed it, making a growing explosion that filled the stage. Seeing as Leon couldn't escape if it meant he have to jump off the stage and into his demise, he took it and hopefully tried directional inputting to keep his character alive.
Vincent
A natural? Her? Not really. All she was doing was mashing the buttons and hoping something good would come out of it. The buttons she pressed had resulted in her bringing out surprisingly moves out of ROB's arsenal but those were only a one time thing. No matter how hard she mashed the buttons again, the moves she did before would never come out again. Unless it was the spinning beyblade rotate arms attack or the supernova laser beam attack.

Her lack of experience with the video game would soon show up as both of them lost lives to each other, mostly Cynthia getting fucked up by Leon, only for her to attack him when he was low so they could equal the score. Once they were down to their last lives and had sustained high amounts of damage, Cynthia thought she could take the game and win another arcade game for herself, however, her lack of experience finally caught up when an item appeared on stage. The item was hit by a walking bomb which only resulted in that item blowing up as well. This was where Cynthia lost as she didn't know what it was, seeing the two explosions, she tried dashing away but it was too late already. She saw Falcon jump off the stage, hoping to evade the blast which was something Cynthia could have done if she didn't panic. The blast radius caught her up, damaging her heavily before... YEETING her off the stage.

That was game over! Leon had won the Super Smash Brothers Ultimate game! Although Cynthia was disappointed with her loss, she couldn't help but smile. This game was so much fun! Who knew games could be this fun when playing with someone who's close to you. "Ah... I guess I lost." Even through her words, she still smiled.
David
Leon breathed out, sitting back. That was too much of a close match that it was aggravating. Oh well, Leon won, right? He set down the GameCube remote gently before springing back up on his feet and giving his Charizard pose. "That was a good match." ~~It would've been better with no items.~~ "Let's play another game," He suggests and tugs Cynthia on her feet. Defeat always leaves a bitter taste on anyone. It's time for them to have fun now. Looking around quickly, he spots some lights flashing over yonder—with music playing so loudly, it could attract a crowd. The game is Dance Dance Revolution. "You said you like to dance, right, Cyn?" He drags her toward the area just as a couple of kids got off of it, done with their session.

"How about you show me what those parties taught you?" Leon doesn't really want to dance so he rather watch her play. Although, he has fond memories working together on a song, trying to achieve perfects with his little brother. It really makes him want to see Hop more. Maybe he'll hit his baby brother up after this to see how he's doing, who's he hanging out with, if he's staying out of trouble. If their mother isn't around, he needs to check up on him! He can't count on Sonia all the time!