>>48202386Machamp/Pikachu/Slowbro are just among the worst characters in the game. Pikachu falls off incredibly after early laning phase and unfortunately Slowbro and Machamp were nerfed to near uselessness. That isn't to say people can't do well with worse characters but they're are much better picks for Pokemon than those.
IE: Machamp is outclassed in role by Lucario, Pikachu is outclassed by A9, Slowbro by virtually any other tank or wiggly.
In this instance, the other team picked even worse Pokemon as Gengar is straight up the worse character in the game. As are Machamp/Garde. They basically didn't have any offensive presence the majority of the game and they lost every objective except for Zapados. Which they won just barely thanks to a cheeky Garde steal. This wasn't enough however because their comp was strictly much worse.