Scramble needs a full four players (two teams of two) - each player takes a shot, the. Each team gets to choose which of their player’s shots they will play from for the next swing.
You can do this solo, on local match, using four players on one controller.
To speed things up a bit, set the match to short tees and do Front or Back 9. You just need to finish a match, no need to do a whole 18 holes.