The source was an e-mail someone got.
Source is shown in a photo on this website. https://gamerant.com/pokemon-go-charmander-community-day-rumor/
I'd be happy if it is Charmander, but you never know with Niantic...
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The source I had was a discord notice claiming that the official community day page said this if translated from Japanese. I can't read Japanese so I'm looking for another source.
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I see that on SilphRoad too but also not translated. They say it does mention Charmander in spite of having a Mareep image.
https://www.reddit.com/r/TheSilphRoad/comments/8cpddc/charmander_community_day_for_may_confirmed_by/