One of the things we all learnt by playing pokemon is that the more you play and the more your inventory will be a disaster.
Items like REPELS, NUGGETS (and every other item that must be sold), EVOLUTION ITEMS and PVP ITEMS are always in our inventory and they are thrown into the misc-items tab, and that creates a lot of confusion which makes us waste time searching for our items.
What i suggest is to create a system which help us remove this confusion and sort our inventory.
I think the best way to do that would be this:
Creating more sections, for example:
1) "PVP ITEMS", where the system will throw all our pvp items like mystic water/charcoal ecc
2) "GENERAL ITEMS", where the system will throw all the items we use for grind/move on the map like "REPELS". We could even add ITEMS that must be sold like NUGGES ecc since they're not gonna stay too much in our inventory and it would be a waste of space to add a section just for them.
The following one is just an idea and i'm not really sure that it would really be useful, but i write it anyway.
3) "BERRIES", where the system will throw all the berries. There are 10 types of berries, and it really create a confusion(as i said before this is just an idea and im not sure about it myself)
------------------ EDIT : ALTERNATIVE WAY ------------------
Like someone wrote below adding more sections would be confusional and bad for MOBILE USERS, so i just suggest to do that in a different way:
It would even be fine if the items would be in the same section and sorted alphabetically BUT EVEN for genres. Like: first all the pvp items, then all the repels ecc, then all items to be sold, then all the evolution items.
Just sorting alphabetically creates something like: 1x pvp items, then 1x evolution, then 2x items to sell then 1x repels, then 2x evolution, then 1 pvp items ecc.
That just make you waste a lot of time and it's confusional.
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This idea should improve the players' experience and so even the game/system.
Let me know what you think. I apologize for my english, i know that it's terrible