This page lists the activites that you can do after the end credits in Pokémon Scarlet and Violet.
Visit the Director
After the end credits, you will be in your dorm room, and you will be summoned to the Director's Office. Go to the door of your dorm room and choose the Director's Office. You will receive a Master Ball. It is guaranteed to catch the Pokémon that you use it on, so you might want to save it for a Pokémon that is difficult to catch.
Gym Leader Rematches
You can have rematches with the eight Gym Leaders of Paldea, who now have much stronger Pokémon. If you defeat all eight, you will get a call from Geeta, who asks you to meet her in the Entrance Hall of the Academy. This will unlock the Academy Ace Tournament.
Team Star Boss Rematches
You will find the five Team Star bosses in their respective bases. You can talk to each of them to have a rematch with them once per day.
Change Koraidon/Miraidon's Form
From the X Menu, you can select Koraidon/Miraidon to switch it between combat form and riding form. If you switch it to combat form and your party is full, you will be asked to move one of your party Pokémon into your Boxes.
The Treasures of Ruin
If you talk to Ms. Raifort between classes to progress her story, and if you complete all of the history classes at the Academy, Ms. Raifort will mark the locations of four shrines on your map. You can open these shrines by finding the ominous black stakes that are scattered throughout Paldea and pulling them out. After you open a shrine and defeat or catch the Pokémon, that shrine becomes a Flying Taxi destination.
New Sandwich Recipes from Mom
Talk to your Mom to learn some new sandwich recipes.
Catch More Pokémon in Area Zero
After the end credits, there are more types of Pokémon that you can encounter and catch throughout Area Zero. You can now ride Koraidon/Miraidon in Area Zero, making it easier to explore.
Catch another Koraidon/Miraidon
If you go back down to the lowest level of Area Zero, you will find another Koraidon/Miraidon on a rocky slope. You can battle and try to catch it.
5-Star Tera Raids, 6-Star Tera Raids, and 7-Star Tera Raids
After you win the Academy Ace Tournament for the first time, you get a call from Mr. Jacq about more difficult Tera crystal battles. You will now be able to find 5-Star Tera Raids. After you have completed some 5-Star Tera Raids, you will get another call from him about even more difficult raids. This indicates that 6-Star Tera Raids have been unlocked, and you can also participate in event-only Tera Raids by pressing X to go to the menu, then choosing Poké Portal, then Mystery Gift, then Check Poké Portal News. The event-only raids will be glowing on the map.
Mr. Saguaro's Request
Mr. Saguaro in the Home Ec Classroom asks you to bring him Sweet Herba Mystica. Herba Mystica can be obtained from raids that are 5-Star and higher. He will give you in return.
Herba Mystica Sandwiches
If you have any Herba Mystica (obtained from Tera Raids that are 5-Star and higher), you can unlock new sandwiches by talking to the person in front of the counter of Every Wich Way.