I'm only listing Ruby & Sapphire here for now. I have not played Fire Red/Leaf Greena and do not plan to. My next Pokemon game will most likely be Emerald. I played Sapphire before Ruby.

Pokemon Sapphire
Like I said before, I played Sapphire first as the boy. I picked Torchic as my main Pokemon. When facing the elite four, Blaziken and Kyogre did all of the work...the rest just sat around. My team was:


Blaziken, Female
Level in the high 70s
Moveset: Earthquake, Fire Kick, Fire Punch, and Sky Uppercut
Equipped: Charcoal


Kyogre
Level in the high 60s
Moveset: Water Pulse, Calm Mind, Ice Beam, Psychic
Equipped: Nevermeltice


Milotic, Female
Level in the 30s
Moveset: Water Pulse, Splash, Surf, ????
Equipped: Mystic Water


Salamence, Female
Level in the low 40s (just enough to evolve)
Moveset: Tackle, Headbutt, Harden, Slash
Equipped: Either Dragon Scale or Dragon Fang


Ninetails, Female
Level in the 20s
Moveset: Flamethrower, Ember, Tackle, Cut
Equipped: Quick Claw


Gardevoir, Female
Level in the 40sh range
Moveset: Psychic, Calm Mind, Growl, ??
Equipped: EXP Share

Pokemon Ruby
I played Ruby a LONG time after the first one. I played as the girl and took Mudkip. I tried, thsi time, to raise an even team instead of 2 high ones and the rest pathetic. When I faced the elite four, my six Pokemon were:


Swampert, Female
Level in the 60s
Moveset: Ice Beam, Earthquake, Surf, Mud Shot
Equipped: NevermeltIce


Groudon
Level in the 60s
Moveset: Fireblast, Flamethrower, Rock Tomb, Earthquake
Equipped: Charcoal


Beautifly, Female
Level in the 60s
Moveset: Silver Wind, Giga Drain, Secret Power, Psychic
Equipped: Silver Powder


Mawile, Female
Level in the 60s
Moveset: Crunch, Faint Attack, Vicegrip, Bite
Equipped: Shell Bell


Delcatty, Female
Level in the 60s
Moveset: Faint Attack, Assist, Double Egde, Return
Equipped: Silk Scarf


Dusclops, Female
Level in the 60s
Moveset: Astonish, Night Shade, Shadow Punch, Shadow Ball
Equipped: Quick Claw