According to Psionics Unleashed (p. 20-21), a psion receives several class skills based on discipline. Most of the disciplines are not receiving their class skills. (Nomad is an exception for some reason; its class skills are working fine.) I have copied and pasted the list below for convenience.
Seer (Clairsentience): Diplomacy (Cha) and Perception (Wis).
Shaper (Metacreativity): Bluff (Cha), Disguise (Cha), Use Magic Device (Cha).
Kineticist (Psychokinesis): Disable Device (Dex) and Intimidate (Cha).
Egoist (Psychometabolism): Acrobatics (Dex) and Heal (Wis).
Telepath (Telepathy): Bluff (Cha), Diplomacy (Cha), and Sense Motive (Wis).
Generalist (None): Use Magic Device (Cha) and any one skill chosen from the above discipline lists.*
*The program is not giving a choice for class skill like it does in Ultimate Psionics.
At revision: 25363
Subclass does not allow ABILITY. Nomad was the exception that had its ABILITY on the SUBCLASSLEVEL line.