Unless your name is Heatran, running a Rest Talk set on a Fire type is risky. Fire types are generally frail, and take super effective or neutral damage to the most common types of attacks in the game (Fighting, Ground, Water) as well as SR damage + damage to weather if it's up. Finally, your -Def nature doesn't help.
I'd recommend the Scarf version of Typhlosion, but you don't have anyone using Stealth Rock, which is literally the most important move in the entire game. Aerodactyl is fairly easy to come by. Use it.
Aerodactyl w/ Focus Sash
Jolly/Hasty/Naive (use the latter two only if Jolly isn't available to you)
Pressure
- Taunt
- Stealth Rock
- Earthquake
- Stone Edge/Rock Slide/Rock Tomb/Toxic
If it's slow and without a priority move, Taunt first, then lay down Stealth Rock. If it's another Aerodactyl or has a priority move (like Metagross often does, or Dragonite), Stealth Rock first.
Earthquake + Rock attack gives you the best overall coverage. Toxic is an okay choice if you want to wear down bulky non-Steel type leads like Swampert.
Stall Sweeper - Focus Blast is a great move to have with 252 Sp. Atk. Eruption + Rest + Sleep Talk + Leftovers is a great combo.
Lucario, Sceptile, Flygon, and Gallade are all quite literally doing the same thing. They are all Life Orb sweepers with little differnce in how they play out. The Pokemon choices aren't bad, but the sets chosen for them are.