With the release of Sun Wukong aka The Monkey King, the transition of DotA heroes to Dota 2 came to an end. However, the introduction was quite controversial as a major portion of the community claimed the then new hero to be unbalanced. As a result, almost every single game of Dota 2 featured a Monkey King due to his overpowered abilities. This led to the developers to roll out a number of updates, fixing the hero and his abilities.
It is because of this, you do not see Monkey King being picked in Dota 2 nowadays. But, this is where Kill Ping comes in. They have written a detailed Dota 2 Monkey King guide which will help you better understand the hero and his many abilities as even today, this hero is quite strong.
Source: N4G PC Dota 2 Monkey King Guide: Get Good with Sun Wukong