Help with team decisions!

I personally would go for Blaziken+Tyranitar+Salamence+Lucario.

The best lead for you team would be Blaziken in my opinion. I haven't tried many of those Pokémon so I may be wrong, but I think they can work well together. Mega Blaziken gets some speed boosts and Swords Dances. I'd choose Baton Pass and maybe Blaze Kick for its other two moves.

When you think your enemy might try to hit you with a Flying/Psychic type move (which are two of Blaziken's weaknesses), then Baton Pass to Tyranitar and finish your enemy off with Stone Edge, Earthquake, Crunch or Pursuit (in case your enemy tries to switch out).

When you think your enemy might try to hit you with a Ground/Water type move (which are two of Blaziken's weaknesses), then Baton Pass to Salamance. Salamence would be really nice, especially if it's switching into a physical attacker. Intimidate becomes really handy and allows you to take more hits. It has decent Attack and Special Attack so you could use it as a mixed sweeper.

I'd choose Lucario for the 4th Pokémon. Lucario has both a decent Attack and Special Attack stat so you could even use it as a mixed sweeper if you wish. Lucario's only problem is its Speed, but thanks to a Baton Pass from Speed Boost Mega Blaziken, you can easily remove that weakness. Lucario also has three priority moves so now that I think about it, Speed wasn't really that bad (lolwut).

This all just looks good on paper, but it might not work as well in a real battle. Do try it out for yourself if you want.