These techniques will most likely always be unavailable. If any of them are removed from this list, it'll be plot events, and no more. These are prohibited. No one can have them.
http://naruto.wikia.com/wiki/Body_Replacement_Technique
http://naruto.wikia.com/wiki/Beast_Wave_Palm
http://naruto.wikia.com/wiki/Beast_Wave_Violent_Wind_Palm
http://naruto.wikia.com/wiki/Rinnegan
http://naruto.wikia.com/wiki/Execution_by_Kiss
http://naruto.wikia.com/wiki/Chimera_Technique
http://naruto.wikia.com/wiki/Limelight
http://naruto.wikia.com/wiki/Jibakugan
http://naruto.wikia.com/wiki/Jashinism
http://naruto.wikia.com/wiki/Amplification_Summoning_Technique
http://naruto.wikia.com/wiki/Attack_Prevention_Technique
http://naruto.wikia.com/wiki/Flying_Thunder_God
http://naruto.wikia.com/wiki/Eye_Mind_Reading
http://naruto.wikia.com/wiki/Future_Telling
http://naruto.wikia.com/wiki/Water_Release:_Water_Sky_Convergence
http://naruto.wikia.com/wiki/Fission_Technique
http://naruto.wikia.com/wiki/Soulbane
http://naruto.wikia.com/wiki/Body_Revival_Technique
All Rasengan variants except:
http://naruto.wikia.com/wiki/Rasengan