Berries and Pokemon with Aromatherapy can remove status. I'd assume the reason you'd just use items is because its much faster. But also--why buy items when there are Pokemon centres? Why have Pokemon centres when depositing Pokemon in the PC auto-heals them?
EDIT: I also like the contrast between Passimilion and Oranguru. The former thrives in teams and gets its strength off its teammates. The latter prefers to live on its own and rather than working together, would "boss around" its teammate with Instruct.
Aromatherapy is a move I've really only ever used when playing competitive battles, also I generally don't heal status effects mid-battle as most of them are not dangerous enough to warrant wasting a turn. If I do have to waste a turn I usually just switch Pokemon. I guess I would use Pokemon amie (refresh) anyways so why just not buy items. I guess I might get annoyed with it by the end of the game. But at that point I will have enough money where it doesn't matter. Money really only matters at the start and middle of the game where you don't have enough of it to go around for all the items you may need.