Just hit it with something bigger. Fattening up your team can get them to overcome their weaknesses from sheer power difference. It's how I kicked his ass with Charizard (after his clawitzer 1-shot my electric-user).
Blaziken is like level 83 (Well level 82 now since i apparently don't understand the concept of saving or something.) Not fast enough to deal with Sierados.
Pidgeot and Greninja are in the early 70s. Pidgeot's Achilles heel is the Ice Fang while Greninja just doesn't have it in him to withstand a [tornado fang]ing earthquake (how does a flying pokemon get earthquake anyway the [tornado fang]).
Garchomp... well 2x ice fang again.
Sylveon is good for the dragons but not much else.
Boost power with Meadow Plate/Miracle Seed?
Sacrifices the venusaurite, unless I can just go and switch the held item halfway through a battle or something.
Or if you wanna grind, battle at the Restaurants. Le Yeah is nice for money and EXP.
When the pokemon are 20 levels below your weakest its kind of hard to grind exp off of them. And I have a vast dislike of the restaurants, especially le yeah for the [tornado fang]ing protect spam, for that arbitrary turn limit/best in x turns thing, just let me kill everything in one hit and get the full reward so i don't have to play the "waste 1/2 turns dancing around to hit that turn limit and hope that [tornado fang]er doesn't spit out a protect or miraculously dodge the attack" game. The one that would actually probably net me decent EXP is locked off till I beat the champion so that doesn't help me either.
I realize now that my complaining is really [tornado fang]ing obnoxious so I'm just gonna go ahead and shut up and play something else. This just isn't fun anymore.