Secret Bases or Trainer Rooms
I know this has already been mentioned somewhere but I really love this concept.
Trainer Interactions are an integral part of this game. At least for me, seeing trainers in the Pokémon center is one of my favorite parts of the game. Currently, the only interactions we have are the dialogue in the center and the “Day with ______” I love these so much but I feel as though there could be more.
Secret Bases: This would be a little room or area with customizable furniture and trainer hang out spots. What I’m thinking of is kind of like the ‘guild’ in Housamo where you can select certain furniture and backgrounds or even like the Room in the Project Diva series. You could get invited to other players based and, if a pvp system is put in place, battle one another.
Gift Giving: This isn’t really a part of the secret base, but please hear me out. I felt like it could be well placed in the game. In the Project Diva series, you can give gifts to your favorite characters to raise their friendship meter. There could be a similar system in place where you can give poke plushies or food to raise a sync pair’s friendship. At a certain level sync pairs can be invited to hang out in your base.
Outfits: This is an extension to the gift giving and friendship level concept. Outfits would be distinct from sync pairs in that they don’t provide a new Pokémon and are purely cosmetic. They would be gained from leveling up friendship or, if needed, could be monetized to support the game without changing the meta, and could allow unpopular characters to still get attention without making a whole new sync pair.
TL;DR: Secret Bases are custom rooms to share with trainers and friends. Gifts and Friendship Level can increase trainer interaction. Outfits help with monetization and character spotlights.