The Throne Room of Fire, in the Pyramid of the Sun, on Krokotopia always seems to have them around the area Krokenkahmen is found.
Since its a dungeon it can be farmed by someone before you. Also, it does not take that long to get there, just in the pyramid, up the stairs, across the aisle, stick to the wall, and either two lefts or two rights and you are there.
I keep on farming that dungeon to try go get the Fire Mander that give a 3 pip Myth card that hits 375 at baby.
You will have to beat Manu Narini before you get into the Krokenkahmen's area, but you will get some loot anyways.
What I would like to know is it Manu Narini or Krokenkahmen that drops the pet, I get different answers.