If you trying to spawn Verm without four players and have the pirate DLC. I suggest visiting either Hyperius or Gees arena. As soon as enter their respective arenas the game will scale to four players. This will last until you save & quit.|
This makes spawning Verm a lot easier, however it will make Verm and his varkid family much much tougher.
Xbox/PSN/NNID: Jambii267 3DS: 0216-0806-8561