Hello! What are the requirements for emigrating to Mongolia?

It was easy when I was there ten years ago. Marrying a local wife can get a green card for less than a few hundred yuan. At that time, I knew that many China bosses married local wives to get green cards for the convenience of traveling to and from China and Mongolia. In fact, their wives in their hometown are not divorced, and they have to apply for a visa every time they get a China passport, and there is a time limit.