I found a Brazilian community server getting ready to open and it is focused on AllTheMons with a big arena duel system.
They made their own serverside mod called CobblemonArena so you can join without installing anything and just fight.
You can do direct challenges or jump into matchmaking with commands. When a battle starts the arena closes up in a circle so nobody can mess with it.
Duels run with a 10 minute timer and 6 Pokemon with free switching. You win by having more Pokemon still alive and ties go to whoever has more total HP.
There is no automatic healing after a duel so your team leaves the same way it entered and every match feels serious. People can also watch as spectators and the results post to Discord with a ranking bot.
They are still finishing development and the server is not open yet but they say they are close.
AllTheMons Arena Duels With Ranked Queue
GG.MINEWIND.NET New Server IPNether Terminal Fight To The Death
This server is running a really crazy arena event. It is a terminal fight to the death and it is themed around the Nether. The whole thing sounds kind of insane but also really fun.
They already picked the main fighters but they still want extra people as reserves. They need around six or seven players who can actually be online at the event time. It happens on January 24th 2026 at 20 00 GMT.
The winner gets a pet some ingame cash and a permanent spot in the Hall of Fame. The loser gets 24 hours of capped HP and gets stuck forever in the Hall of Shame. So it is super high stakes and kind of scary.
To join you just go on the server or Discord and message the owner. Then they will tell you if you are a fighter or not. It feels like a small but wild community that really likes dramatic events and bragging rights.GG.MINEWIND.NET New Server IP