i went with all lvl 100
poocheyena for run away from wild Pokemon ability
metagross/ steelix
flygon
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the best team for battle dome in Pokemon emerald is a grass type(against swampert , and a rock type(against charizard and salamance)
I'd say machamp latios metagross
empoleon,luxray,starraptor,rappidash,haunter and dusclops.
Well i think it all depends on what your up against, but the best thing to do is try and have a fire, water, dragon, dark, and flying(so you can fly places and use defog too)(crobat is best) and a 'HM' Pokemon to use outside of battle(Bibarel is the best).
No that would be nice though to get more light defeat pokemon.