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Custap is my favorite berry.
A neat little gimmick could be mixing berries into different types of berry juice. How I see it working is, you're able to mix a maximum of any 3 berries into one item and when consumed you get the effects of all 3 berry. You're only allowed to use 1 berry from each "catagory" of berry, for example, only 1 stat boosting berry, 1 type damage reduction berry, and 1 status removing berry. Also make it a key item so only one pokemon can use this and on top of that, you can only use this item once per battle, so now recycle or cudchew shenanigans.
Theoretically you could get +1 to speed (Salac), semi-priority for one turn (Custap), and restore some hp (Wiki), in one turn. Obviously this is super broken so each category of berry has downsides, Salac lowers both defenses by one, Custap makes all your moves work like hyper beam where you have to recharge every other turn, and Wiki lowers your speed by one stage.
Lastly, so this isn't super duper broken, make it so in online battles, you can see which of your opponents pokemon is holding the berry juice AND what berries they added to it.
I don't wanna reread this a third time so sorry for grammar or spelling mistakes. I think this could be a really neat feature that adds a lot of customization to a single pokemon. If it's still too broken you could make it so a regional form of shuckle is the only pokemon that can do this. Make the shuckle have 80 in every stat or something.
- Shuckle