Using the Coscorrona costume, travel to the Templo de la Serpiente teleporter, and then head directly over one room to the left.
There will be some enemies that you can grab, so be sure to throw them threw each other (enabling you to throw other enemies). Keep on repeating this until all of the enemies in the room die, and then proceed to reset the room by dropping into the lava below you.
Progress carries over despite not hitting a checkpoint, and you are able to gain grab/throw credit despite doing it on the same enemy over-and-over.
Should you mistakenly clear the room and save, just teleport to a new zone and then back again.