Overheat:Obtained By Beating 5th Gym in sapphire
Sky Uppercut:Learned at lvl 59
Blaze Kick:Learned at lvl 36
Fire Blast:Bought At Lilycove mall

These are the best move for anyone who has a Blaziken.
I had Ruby version(lost it :( )LVL 100 Blaziken man did it kick ass

These Moves Will get you through the pl (pokemon league) real quick and easy.
Sky Uppercut:It will take out pretty much every pokemon out in the first stage.Also useful for when Salamance (4th Stage dragon lvl )when he uses fly and cant get him.Useful for killing sealeo/walrein (3rd stage ice lvl)

Overheat:Will instanly kill shifrty cacturne and sometimes absol(1st Stage normal/water/grass).Good for Glalie (3rd stage ice).Might kill some of the ghost(2nd stage ghost).Some of steven's metal pokemon(5th stage metal) such as skarmory aggron and metagross.

Fire Blast:Kind of like Overheat,use it if Overheat runs out

Blaze Kick:Good for the dragons(4th stage dragon).

Hope this helps any.