I can confirm they have been steadily decreasing the rare drops since the start of the event. Tangela, Chansey have significant reduced spawns based on my own and other sightings. "Preparing us on the aftermath", just decrease the length of the event if that's what you want.
Scumbags.
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Dear Drystan
Niantic does not read this forum. Stop posting here. Directly contact Niantic using this form: https://support.pokemongo.nianticlabs.com/hc/en-us/requests/new?ticket_form_id=911688
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Try to search for quest “Power up Pokémon 5 times” by spinning PokéStop, so that you can encounter Chansey in this way.