Which Pokémon have higher spawn rates during the Valentine's Day Event?

Niantic posted information on their Valentine's Day event that is taking place. In the post, they mention a few Pokémon who will have increased spawn rates

Throughout the celebration, you’ll notice that Chansey, Clefable, and many other adorable pink Pokémon will be encountered more frequently in the wild.

Which other Pokémon fall other the "many other adorable pink Pokémon" category?

Also, as we saw during the Halloween event, there were undocumented Pokémon who had an increased spawn rate. Are there any undocumented Pokémon in this event who have an increased spawn rate?

Solution 1:

While it's still quite early in this weeklong event, this thread has listed confirmed spawns not explicitly mentioned by Niantic.

Aside from Clefairy and Chansey, which were mentioned in the official announcement, it appears that the following pink Pokémon have been confirmed to have increased spawns:

• Clefable
• Porygon
• Lickitung
• Exeggcute
• Jigglypuff
• Wigglytuff
• Slowpoke
• Slowbro

In addition to these, there are also increased odds to hatch Cleffa, Igglybuff, and Smoochum from eggs obtained during this event.

Solution 2:

The statement is most probably hinting at the Pokemon's official Pokedex color listing. Bulbapedia lists the following Pokemon in the Pink category that are also available in Pokemon Go:

• Clefairy
• Clefable
• Jigglypuff
• Wigglytuff
• Slowpoke
• Slowbro
• Exeggcute
• Lickitung
• Chansey
• Mr. Mime
• Porygon
• Cleffa
• Igglybuff
• Smoochum

Since these have officially the color pink, we should expect these and only these to be affected. Mr. Mime, being a region exclusive Pokemon, will still only appear in Europe.