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What's the point of a visitor visa? In general, the country you want to visit does not want you to become an illegal resident so they run a through background check on your ties, finances and so on. There are other concerns of course (security, mostly) but this is the most important one.
Once you indicated you want to get married in a given country your credibility of "hey I am just visiting" drops to near zero since you already explicitly stated you actually wanted to marry and settle. In general again you won't find explicit laws or regulations saying you can't get one but you will face an almost insurmountable credibility challenge.