https://qz.com/819677/nintendo-pokemon-go-profits-we-finally-know-how-much-nintendo-made-from-pokemon-go/

This news article claim 19%. Not to mention the boost it brought to the 3DS, old Pokémon games and Pokémon Sun and Moon. 

They probably get dividends from Pokemon Co. each quarter based on total profit.  That means they get a slice of Pokemon Co.'s slice of the pie.  Most of the earnings will probably stay with Pokemon Co. for them to reinvest.  There is no actual way to know unless the terms of the original joint ownership agreement are disclosed.  That's where the founders decide how a co-owned business will be managed and how much will go to each of the partners.

Of course, even a small percentage is a lot of money.  

If I'm not mistaken, they also have a stake in Game Freak, which means dividends on the profit they turn, as well.  That would be a slice of Game Freak's slice of Pokemon Co.'s slice.

Insane how much revenue it brought in, I played a lot for about 4-5 months and then stopped when popularity fell off. Didn't spend a dime on it, but clearly millions did. Never heard of the other two games mentioned.

Quite a lot, wonder how much Nintendo actually got :p

That would be around 180m. Not bad.

100% this!

Let's not give Niantic a free pass. While they made one of the biggest successes in 2016, they shortly followed that up with dozens of the stupidest decisions for any gaming company for the year.