From Bulbapedia, the community-driven Pokémon encyclopedia.
Omega (Japanese: オメガ Omega) is one of the characters of the day in Reunion Battles In Nimbasa!. He participated in the Club Battle tournament but lost in a battle against Dino and got knocked out of the very first round.
Omega has at least two other Pokémon as those who entered the Club Battle were required to enter with three Pokémon.
Club Battle (Top 16)