How to invite a friend as partner in 2v2 online?

[brianakin]

When I try to invite someone to play as my partner, I can only do so with the Lobby locked. Then when they accept the invite, and I unlock the lobby, the players are set in that order, meaning I have to play against him. Is there a way to invite a friend but designate him as the partner?

[prettytail]

should invite him/her after unlock the lobby. Any first invited player always becomes the partner when you are in the lobby, but when invite after start a match, the player will be an opponent.