Battle in the Meadow Monster Farm: Enbanseki no himitsu : Season 2 Episode 33

Naga sends the Tainted Cat Brothers to destroy Genki and his friends. Mocchi and Genki are separated from the group, and meet with the Tainted Cat Brothers' old mentor, Kato. Kato trains Genki and Mocchi, and together the two help the Tainted Cat Brothers realize that they were wrong to turn against their mentor.