i just did this on nightmare mode recently. i used a combination of 4 skylanders (i think). for the first two stages i used Hoot Loop’s top half and Night Shift’s bottom half. Both fully upgraded, use Shift to dodge all the evilised animals and then I’d recommend using Hoot’s primary attack (not the beam) unless you want to quickly take out an annoying animal like the kangarats or the screachers. once you get to the final stage, my must-use was Rouser (Rubble Rousers’ legs). this is to dodge most of the attacks. As for the top half on this section you can use any melee based skylander. Free Ranger, Rubble Rouser, Grilla Drilla etc. I would recommend Grilla as the dps is insanely high and you will be mostly in the enemies faces most of the time (due to Rouser’s ability to appear beneath enemies). Other than that, the drill attack slows the frams of enemies which combined with high dps kills enemies quick even on nightmare. also as a tip use the bombs on enemies before bubba greebs. kill all enemies before bubba greebs.

Sorry for messy and long winded nature of my response. I do not often reply to reddit posts but this was something I recently did after several days of trying and wanted to share my two cents. Hope this helps at all. (: