Blaziken- Blaziken will learn Blaze Kick by either going to Blackthorn City to the Move Remember-er and teach it Blaze Kick in exchange for a Heart Scale. Either that, or if you have a Combusken, evolve it. Once it evolves into a Blaziken, it'll will say it wants to learn Blaze Kick.
Lucario- For a Lucario, you have to do some breeding, since Blaze Kick is a breeding move for Lucario. So, you get a female Lucario and put it in the Day-Care with a male Pokemon that knows Blaze Kick like a Blaziken or a Hitmonlee. In result, you should get a baby Riolu that knows Blaze Kick.
Hope this works!