It would be a good idea to make a game mode, where you can challenge people who want to make a team, and you fight against them with your team
Similar to Badlions PvPLike @SlainByMe said this has been suggested many times and I would love to see this be added. Duels is fun but I think being able to have 2v2 3v3 or even 4v4 would be even more fun.