What is the rationale behind Sitrus Berry being legal when it heals every mon in the tier fully for dropping below even just 50% HP, not even 25%.
It creates a queer metagame where you usually need to OHKO outright or 2HKO with rising power in order to faint things. It is in my opinion as far as I can see overly forgiving for the user and overly unforgiving for the opponent.
There's also Berry Juice which for the majority of the tier functions the same way. It doesn't make sense to me to allow these other than prolonging games, but in a strange way that doesn't compare in any other metagame.
Oran Berry of course fills the healing item role for Little Cup perfectly well, while not enabling most mons to make a full recovery from the brink of a KO. It is sufficiently forgiving for the user while not punishing the opposing mon for not being quite strong enough.
This is the way I see it. I simply have not seen the arguments in favor of Sitrus and Berry Juice being usable.