From Dissidia Wiki
Online capabilities include:
- Lobbies with support for individual one-on-one matches and team battles with another person
- Group Battle where up to 10 people can participate in a maximum of 5-on-5 elimination style Tournament battle or a fixed set of match-ups in Round Robin. During group battle inactive players can spectate the on-going match.
Currently the PPSSPP version 1.1.1-222-g3cc7891 is known to consistently support four concurrent players.