Hoenn tips for Elite Four?

Pretty new to MMO and unsurprisingly I've been getting my ass kicked, but I've managed to make it to the Elite Four in about a week. I've been hard stuck here though.

My party right now consists of: Blaziken, Electivire, Azumarill, Honchkrow, Donphan, and Druddigon, all within levels 55-58 which is the max except for Donphan who I'm using EXP Share on. I just added him back to the party but he's level 50 so he's not really that outclassed in terms of level and he'll be back up there shortly.

My main problem is no matter which Pokemon I try, somehow the E4 manages to have not only a perfect counter for one of my Pokemon, but also a move that one/two hits my backup Pokemon regardless of what it is. I send out Azumarill or Blaziken? They use an electric move. Then they use Ice Beam on whatever I send out next. I don't even bother buying potions or revives anymore because not only am I almost flat broke half the time and almost all of the good money making techniques are post-game, but it almost guarantees that if I waste a turn to revive or heal a different Pokemon, my current one is going to get knocked out. Their speed is almost always better than mine, too, no matter what Pokemon I use regardless of level. I can almost never land a hit first. When I do, it's a miracle.

I know the E4 is supposed to be hard and this isn't my first rodeo in a Pokemon game, but even Cynthia didn't give me this kind of trouble. Does anyone have any tips?