The battle against the Beast Pirates lasted for five days. On the fifth day of the battle, Jack lost his patience and unleashed Caesar Clown's Koro gas, which left the Mink Tribe poisoned and drastically weakened. The following day, Jack left Zou after hearing about Donquixote Doflamingo's defeat and capture, and the minks were later saved when Sanji and his group came to Zou.
When the rest of the Straw Hat Pirates arrived on Zou, Nami was sleeping on Yomo's belly in the Right Belly Fortress. After Chopper came into the room to inform Nami of Monkey D. Luffy's arrival, Yomo expressed his happiness about her friends arriving and started sitting up a little too soon, causing Nami to stumble and fall, which he apologized for.
Shortly after, Yomo took part in the feast with the Straw Hats.
The following day, when Inuarashi, Nekomamushi, the samurai, and the pirates returned from the Whale Tree with Raizo, Zou began shaking as Zunesha started crying out, throwing Yomo and the others into a state of panic. Jack had returned and was attempting to destroy Zou by killing Zunesha, who retaliated on Kozuki Momonosuke's command and sank Jack's fleet with one blow, calming down Yomo and the others in the process.
Later on, he requested to go with the Sanji retrieval team because Nami liked sleeping on his belly, but was told to stay behind on Zou by Nekomamushi.
↑ 4.04.1One Piece Manga — Vol. 82Chapter 822 (p. 10),
Yomo attempts to join the Sanji retrieval team with the reasoning that Nami likes sleeping on his belly.
↑One Piece Manga and Anime — Vol. 81Chapter 808 (p. 9) and Episode 757,
Monjii states that all the minks are natural-born warriors and that the Musketeers have been trained to an even higher level of combat prowess than the average mink.
↑One Piece Manga and Anime — Vol. 81Chapter 810 (p. 6-8, 10-11) and Episode 760,
Wanda and Inuarashi reveal the outcome of the battle between the minks and the Beasts Pirates.