If you don't SIM during certain battles such as Light Side/Dark Side and Cantina, you are given a choice of allies to help during the battle. Some of these allies are actual players although there are a lot of computer generated generic allies. If you use the real player, you have a chance to send him ally invite after the battle. You also have chance to send ally invite to players that you have fought in Squad Arena. Last but not least, you can either ask for someone to give you their Ally code, or you give others your Ally code to get invited.
