Pygmy Mountain Gorilla is a level 15 creature that is found on Secret Island. It is not especially difficult to tame. The point is that it spawns in a wave area, which makes things a bit more difficult. It is very important to stay just outside the wave area during the hunt in order to avoid Mountain Gorilla waves to start. The best position is [38184, 19467] and you need to be equipped with a long range weapon to be able to tag any spawning Gorilla. Then you have to kill regular Gorillas over and over again until a Pygmy appears. The regular Mountain Gorilla spawn is extremely small, with two Gorillas occuring at the same time at most. All you need then is patience...

I have found and tamed a Pygmy Kong. Pygmy Kong occurs occasionally among regular Kongs on Secret Island. This is a level 36 creature, and the most difficult I had to tame so far, much more difficult than Hogglo Pygmy. I am now level 40 in the Animal Tamer profession and level 50 in the Evader procession, and the process of taming a Pygmy Kong took me more than two hours. Run RiverRun Run was present during the first hour, and could provide assistance with healing and moral support. 

The whip I used - a Dominax Original Boiga (L) - lost more than half of its TT value during the fight. I also used a Portable Repair Unit (L) to repair my Angel armor regularly for greater comfort. Pygmy Kong has a very high spirit, and it takes time to lower it sufficiently and make an attempt to tame this ape. In my case, two attempts were necessary. Maybe the Artemic Ring (L) I wore helped a bit.