Astute observation. The answer is never. But in this series there are two possibilities. One is that Yajirobe picked it up while training with Kami during the Saiyan’s impending arrival to Earth, but then never told anybody he had this ability. The other is that he recently drank Karin’s ultra divine water and survived the near-death experience, just like Goku did as a boy, and likewise never told anybody.
When did yajirobe learn to sense ki?
Astute observation. The answer is never. But in this series there are two possibilities. One is that Yajirobe picked it up while training with Kami during the Saiyan’s impending arrival to Earth, but then never told anybody he had this ability. The other is that he recently drank Karin’s ultra divine water and survived the near-death experience, just like Goku did as a boy, and likewise never told anybody.