Google Ads and Facebook do not have a significant level of reach within China, however it is possible to reach the key markets within the region by advertising directly on their most popular platforms.
Baidu Tuiguang is a lot more regimented than Google Ads. Tuiguang requires you to have a business license, proof of ownership of your website, a minimum of $7,200 USD, and it takes about 45 days to process the account. However, with Baidu being so popular in China it is definitely a great bet on advertising to a large market in China.
In order for you to do paid advertisement on WeChat, you must have at least one verified official account, this can be a subscription or service. As well as this, there is quite a significant advertising cost across the platform.