Beating the battle frontier

[Fairy Type Arceus]

I have been trying to beat the emerald battle frontier since I was 8 and have only ever managed to beat Brandon and Lucy. Do you guys have any startgies I can use to get to and beat each frontier brain? I know the palace is random ( although I did make it to him) the others have to have some plan behind them right?

 

[~ Blazing White Yang]

Well for the Factory you're genuinely on your own You never quite know what Pokemon you'll run into.

With the Arena, I think the best way to clear this is to try and hit fast and hard. You're rewarded for staying on the offensive with the Judge, as well as maintaining higher health than the CPU. Definitely avoid Pokemon that serve more as tanks.

The Palace actually isn't random per se, just...Complex...You will need some pretty sound knowledge of your Pokemon's Nature, and how that will guide their actions. The trick to this one is setting up a moveset that compliments a Pokemon's Nature, but then to some extent you also have to consider whether or not its good for the species (in terms of base stats and movepool)...

At the Dome...This probably sounds vague, but I just try to keep a team that's as well rounded as possible (namely in terms of offensive damage output and resistances). So that no matter what pairing of 2 I choose for a battle, I'll can generally prepared...

 

[Poke Trey]

I too also have issues beating them because I came in the 1st time with Blaziken, milotic, sceptile, Aggron, manectric and swallow but no success.