How do you send s.o.s mail on wfc communication on Pokemon mystery dungeon2?

To send an SOS mail in Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness, access the "Mail" option from the menu while in your base. Choose "Send SOS Mail," then select the dungeon where the Pokémon is located and the specific floor. After confirming the details, your SOS mail will be sent out, allowing other players to help rescue the stranded Pokémon.