Credits:

YeahPotato

How To

1) Before initiating a battle in a script, setflag 0x0908 to mark the next battle as a Tag Battle and setflag 0x0909 if you want two different opponents

2) setvar 0x5011 X, where X = the ID of the trainer data (from data.trainers.stats) to use for your partner in battle. Do the same for 0x5010 to set a second opponent.

3) setvar 0x5012 X, where X = the ID of the backsprite (from graphics.trainers.sprites.back.enter) to use for your partner in battle.

4) Initiate a battle using a command such as single.battle or any other battle command.

NOTE: 0x0908 automatically clears after battle.

NOTE: setflag 0x0909 can be used to set two trainers on the opponent's side of the field. See the CFRU docs for more info.

Happy Hacking!