If you play as a Gangrel he teaches you celerity and if you play as the other clans you gain access to protean. I don't recall the exact words but if you ask him that you wanna know more about him he replies by saying that " You ( pc ) know more about me (Beckett ) than i know about you, why don't you tell me about yourself " at which point you are given 4 reply options two of which are stat based. One based on persuasion and one based on seduction. Now if you use the seduction dialogue you say something like " If someone is as good looking as me , they can get anything they want " to which he replies " Maybe the Nosferatu are right in their prejudices " which basically means that the Nossies hostility towards the pretty bloodsuckers might have some validity to it. You gain nothing from using the seduction dialogue.

Now if you use persuade on him he will tell you that Beckett isn't his real name and for persuading him in telling more about himself you get 1 XP. You will need a minimum of seduction 6 and persuasion 8 to gain access to these dialogues. He gives you access to protean when you reply to his initial question by saying that " if i given in to the beast , what more is left ? " i don't remember his reply to this but i know he teaches you protean after this. If you play as a Gangrel you tell him that " I have nearly mastered most of my disciplines" to which he replies " very impressive for one so young " and tells you that you need to learn something more " practical" after which you gain access to Celerity as a Gangrel. Now both protean and Celerity can be raised only up to lvl 3 and not more than that so keep that in mind.