Connecting
To connect to the Cobblemon Adventure map, just use the address:
fab-mon.gameweenies.net
To connect to the Cobblemon Adventure map, just use the address:
fab-mon.gameweenies.net
The recommended installation for joining Cobblemon Adventure is to use the Cobblemon Official Modpack from Curseforge or Modrinth. The server is running the Fabric version.
Just use your preferred launcher, neither is particularly better or worse for this scenario.