It's not clear yet what Rayleigh has actually taught Luffy (currently at chapter 600)
However after staying on that Island for 2 years, with Rayleigh being able to use all 3 types of Haki, it's pretty obvious that he's going to teach Luffy the same. Plus in chapter 599, Luffy used the colour of the conquerer to subdue the fake Luffy, which was already established as his type preference.
3 types of Haki to learn:
Kenbunshoku Haki - Color of Observation
Busoshoku Haki - Color of Armaments
Haoshoku Haki - Color of the Conquering King
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No, the dark lord (raylegiah) allreadt taught luffy that.
yes but he has to absorb about 100 shadows to become nightmare Luffy
Hancock and luffy's crew and shanks
Goku wins by blowing up the planet luffy is standing on.
luffy would most definetly win although looking it up, if luffy did the 1000 degree bazooka, plastic man would not live very long.