Episode 156 - Black Clover - Anime News Network
With episode 156, the training continues, only this time with Yami getting his own share of it. Until the 18:20 mark of the episode, that single sentence adequately sums up what happens in the episode. What happens after that is, by far, the more interesting part. Rather than dwell on lengthy segments of training with each of the Spirit Guardians, the first part mostly focuses on Gaja's training of Asta and Yami training with Mereoleona (whom Yami refers to amusingly as “Sisleona”). In the former case, Luck and Magna seem to have been completely forgotten about, as they are not mentioned ...
Source: animenewsnetwork.com