I don't see a reason for the E4 to be monotyped. They aren't like the gym leaders where there is 1 of each, they are just strong trainers. They aren't really specified to be of a certain type, and it's too restricting this far into the game (especially for trainers like Laura and Anna who use pretty bad types to begin with). They could have a primary type, and have maybe 3 pokémon of that type, similar to the rivals or Cal, and have the rest of the team fit the aestetic while covering for weaknesses and abusing the field. A Porygon fits Noel so much better than it fits El, since Noel is more analytical. Also, I don't really see a way to make a normal type trick room team that isn't just weaker than Radomus. And Porygon2 can't hold both Amplified Rock and Eviolite, which severely limits it's support abilities.
Also, I think giving Drampa the STAB Judgement is just stronger, since a Fist Plate would sacrifice the 1.5x field boost for normal type moves. STAB Judgement with 1.5x for Judgement, 1.5x for Normal type boost and STAB hits an effective 405 base power. Even if resisted, that is 204 base power. The only coverage that is really necessary is for things that 4x resist it, and the only things that do so are Aggron/Bastiodon etc., hence Focus Blast. Also, Fist Plate is a bad idea since you have to forfeit the magical seed, which gives a free +1 Choice Specs boost and Magic Coat.
Dragon Pulse is also fairly redundant since not a SINGLE Pokémon resists Normal+Fighting. And it doesn't hit a single Pokémon harder besides some rock types, for which we already have Focus Blast.