S
From all the footage Ive seen, he does come across a little weak, and being a grappler in general does seem incredibly hard in this game; everybody looks soo speedy.Machamp looks the closest to a traditional grappler, having rather poor combos in exchange for a few moves that are extremely powerful on their own (Any of his Pokemon moves while under the effects of Focus Energy).
I have trouble imagining him excelling in top level play with how hard it is for him to approach, though. Characters like Gardevoir and Chandelure with a strong ranged game seem like they wouldn't have any trouble keeping him out forever.
Gengar is probably one of the characters Machamp has an easier time with as it's forced to move into his comfort zone if it wants to deal any meaningful amounts of damage.
It's also worth noting that Machamp got nerfed in several ways in the aftermath of that tournament, possibly as a knee-jerk reaction to that player's performance.