Rescue Team:Team Leader

'Say Farewell' is the command given when the leader wants the target Pokémon to leave the team forever. Pokemon that are given this command will disappear from the team forever, unlike 'Rescue Team/Gameplay Elements/Stand By' which only commands the target Pokémon to stay in its Friend Area. Legendary Pokemon that are dismissed can be fought and recruited again with the exceptions of Latias & Latios. 

Methods

There is only 1 method for giving this command. However, there is a second way for Pokemon that have just been recruited and aren't considered full members of the team yet. 

Method 1

This works for all Pokémon except the starter and the partner, neither of which can ever be dismissed. Only works in dungeons. Beware that the item of the target Pokemon will be lost.

Step 1	Step 2	Step 3
Go to the friend area where the target Pokémon rests.	Face the target and press A or B. A menu should appear. Select 'Say Farewell'.	A question will be asked. If you want the target to leave, select 'Yes'. If not, select 'No'.
Step 4	Step 5	Step 6
	If yes is selected, a text box should appear:	After that, the screen is refreshed. The leader reappears at the entrance of the friend area and will no longer find the target Pokémon at the spot where it once rested.

External Sources

Original Fandom Port