How do you get yanma in ss?

Question

Just wondering

Answer 1

You can get Yanma at route 35. There is a 1% chance to get it but on the radio, on the channel with prof. Oak, he might say that yanma is swarming on route 35 so then it has 40% chance to appear

Answer 2

I don't know if it can always happen, or if it was a random occurrence, but I caught one in the national park.