Hello! I’ve been playing Pikmin Bloom since September ‘22 and have been enjoying the game ever since. I just wanted to throw out some suggestions and ideas that I think would be nice additions to the game in hopes they can be implemented someday 
Regarding postcards..
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Ability to submit updated/better photos for postcards. I know the POI (point of interest) spots are from Niantic’s database submitted by users of Ingress and Pokémon Go. It would be nice if Pikmin Bloom players could also submit too. I think for PoGo players they need to be a certain level to submit so maybe higher level PB players could also have that option
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If Pikmin have flowers on their heads when entering a mushroom battle they should keep them for the postcard photo even if the battle ends the next day after the daily reset. Usually when I send Pikmin out on expeditions for fruit or seedlings they keep the flower when they bring back a postcard even after the reset happens so it makes sense to do the same for mushroom battles too
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This one’s a stretch but the ability to feed Pikmin nectar after putting them in a mushroom battle. To make it fair it could be purely cosmetic and not increase the team strength if fed after joining the battle. I just love when my Pikmin have flowers in their postcards and sometimes I have to join mushrooms quickly to avoid it filling up especially if I’m trying to join using my free battle. This could also apply to those that mainly feed their Pikmin once they’ve transitioned from leaf to bud stage. Mushrooms done at the start of the day won’t give you enough time to get to the bud stage to make use of the 2x flower petal bonus (if that makes sense)
Regarding weekly challenges..
- Option to have more than 5 users in the weekly challenge. To make it fair you could increase the goal for more players added
Idea..
- A party walk but for planting flowers