Search results for query: *

Well, they included Raticate, Beedril and Seaking in that image. So, it's clear they don't care so much about the interactions of these Pokemon with Ash. The weird thing is that we never see that Ash catches Mr. Mime. So, it's a surprise he is considered Ash's Pokemon.

In the official twitter of Pokemon anime, we have this post: View: https://mobile.twitter.com/anipoke_PR/status/1213701662960803841 I'm not totally sure, since I don't know Japanese, but the twitter seems to mention Mr. Mime as if it belongs to Ash.