When the player logs in with a Pokémon Sun, Moon, Ultra Sun, or Ultra Moon profile, they will receive the following personal notification.
“The Pokémon Global Link (PGL) was originally started to support Pokémon Black Version and Pokémon White Version in 2010. To show our appreciation to PGL users, we are giving away a special Pokémon: Munna, the partner Pokémon of Fennel. This Munna first appeared in the Pokémon Dream World at the opening of the PGL.
You can receive Fennel’s Munna until February 24, 2020, at 23:59 UTC. We appreciate you using the Pokémon Global Link until the service ends, so please enjoy this special thank-you.