Caporei and Grendam usually.

The Argentiums in general. Martial Arts and Aura Manipulation is basically their thing, not to mention why they're so influential. They're not afraid to square up against wild Pokemon if they have to. Their team aren't the only well-trained battlers at their disposal.

Side note: Everyone that Elio personally knows or has some connection to - rivals and archenemies included, can throw hands as well. They would even fight others as their 'mons battle. Thrill of the battle and all that jazz.

Suzuen and Xavion XD

Gee I wonder...
But seriously, it's 1000% Jin. Throwing hands is the girl's lifestyle. But you'd be surprised how well Mary can throw a punch. XD

Linnaea hand down. If you 'asked' her she'd beat you senseless then fuck you senseless once you come to-

Estella wants to believe its her, but its definitely my male Legends OC

Haven't introduced her properly, yet, but Xochitl is a pretty proficient fighter: having been raised to be an important figure in her community, being passed down some traditional hand-to-hand techniques, along with the draconic strength passed down to her; any hands she throws are trained to leave a mark.

For sure Sivrit, the Dragon-type gym leader.
He's got some issues.

Let's just say, don't piss off Norra nor Eudoxia.

Kingston
(later Eric and Ezio)
((way before them Seina/Suzu))