Only available to those who unlocked a special story chapter called “Shroud of Memory”. To unlock the chapter, you must have been a subscriber continuously from January 11th, 2016, to August 1st, 2016. He is an NPC Twi’lek who sweeps your stronghold with a holo-broom.
If you have the chapter unlocked, you can still earn Jollo by sparing him in the chapter.
If you do not have the chapter unlocked, you will be unable to earn him and he is retired.