Hey, I'm going to be doing a playthrough of a Gen III Hoenn game (haven't decided which quite yet but I'm leaning emerald) and I'm wondering if anyone has some tips on putting together a comprehensive and GOOD team.

Basically I'm looking for decent 'mons with good type coverage, ideally three physical and three special users. An important note: I will NOT be using trade evo 'mons, so anything like that is a no go.

Tl;Dr: Who are the best hoenn Gen III pokemon to use in a playthrough w/ no trades?