What is a good Pokemon Ruby/Sapphire team?

I'm replaying Pokemon Ruby, and I chose Treeko for my starter, because it has very good stats. I've been asking questions like this one, and so far I haven't gotten very good answers. I need a balanced team, a team that could help me get through the Elite Four and the Champion. Any suggestions? Also, I cannot trade (because I lost the link cable) or use hacks (because I want to be fair), so do not give me suggestions of Pokemon like Gengar or Charizard.

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