I'm Disappointed in my Team.

Honestly I'm at a loss. Ralts was a nightmare to level up but it's paying off for sure. Aron is awful but I'm trying to hold out and see if he'll get better. Marshtomp is a liability that constantly faints. I don't remember them being this bad. I just got trapinch and it's already better than Marshtomp and Aron. And Swablu?? Just awful! Is this just a bad team? Grinding is a nightmare in this game so I don't necessarily want to start over. Would you drop anyone? More than one? And who would you replace it with? Who should I be more patient with? Not a fan of this group.