Valentine's Event 2023
The Valentine's Event 2023 started Fabruary 3rd and lasted till the 14th!
During this time, users were able to obtain Sweet Hearts and send out Valentine's Cards to other users.
Every user who sent out a card to five different users were able to obtain a brand new Legendary Pokémon on February 15th.
The more Valentine's Cards you sent out, the higher were your chance of receive a Shiny Version of the mentioned new Legendary Pokémon.
Every Valentine's Card cost 50 Sweet Hearts each to send. Granted the user hadn't put you on their blocklist, you would be able to send them to any user. You also have the option of attaching a message or anonymously sending the Card, though neither of the two are required.
Sweet Hearts are obtained by interacting or by sending a Dream World Plushie to another user.
There is no difference in sending a plushie with low DP or high DP cost. The change of receiving Sweethearts is the same because each DPs has its own chance of giving a Sweetheart.
Once obtained, they could only be used to send Valentine's Cards to other users.