If you are looking for the Smogon-recognized metagame called , this is actually a 1-on-1 format with unique rules.
Click on a friend's name and select the Multi Random Battle format from the dropdown menu. can you do 2v2 in pokemon showdown
Look for "2v2 Doubles" under the Smogon Metagames or "Other Metagames" section in the format selection menu. Popular Double Battle Alternatives If you are looking for the Smogon-recognized metagame