Where does Blaziken learn blast burn in ruby?

to let blaziken to learn blast burn is trade it for a charizard then you need to catch a latias (this is only for sapphire) then level it up to level 100 then after that put charizard at first in your party then summary it then their will be a bad egg at your party after it hatches you have to turn it off (this is not true )

this is the truth hatch it with a charizard who knows blast burn.