Rival!? Genuis Zoid Hunter is the fifteenth episode of Zoids: Wild. It first aired in Japan on October 13, 2018.
This episode introduces a "Rival" to Arashi, however it's quickly clear this is a joke character, and not a serious contender. The character, Hijiki, can't ride or touch Zoids, despite leaving his village years ago to become a Zoid Hunter.
He does help them out though, so in return Arashi and the other entertain him and pretend he's the leader of team Freedom to impress his parents.
Death Metal show up and he actually manages to pilot the Liger briefly.
The post-credit scene is of some importance in this episode, as it shows Penne talking on a radio, saying she's watching Arashi and the Liger.