Do NOT Triple Post, It is spam.
Only? I was Level 81 when I beat Ruby abnd Emerald.
Emerald is easy, simply equip Sprint Shoes on all of your characters, along with Mime. Make sure one person has KOTR and Underwater Materia. Final Attack paired with Phoenix is also a good safety.
When you encounter Emerald, cast KOTR as soon as possible. Then Mime it with all of your other characters, just keep Miming until Emerald is dead.
Ruby is a little trickier, make sure you have two people dead, W-Summon, Final Attack paired with Phoenix, Hades, KOTR, Three Sprint Shoes and three Mimes.
Go into battle with two Characters dead, Ruby will stick his hands in the ground. Now revive your party and W-Summon Hades then KOTR. Hades will stop Ruby, KOTR will damage him. Then just keep Miming. And that's all there is to it.