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 had lost in a battle against Dino and was 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)