Sup. I created my account just to post this comment, so here I go I guess.
I feel like Harvest should be unbanned. Here's my reasoning:
1. Hyper-offensive physical teams are incredibly powerful, and stall teams are extremely hard to get through. A team with Ripen + Gluttony + Harvest + Cheek Pouch not only has good recovery against hyper-offensive teams, but it can also get some boosts to get through Stall teams.
Pinch Berries would heal 99% HP, with a 50% chance of growing back at the end of the turn. This gives many semi-fragile pokemons the ability to fight back combos like Hustle+No Guard, Adaptability + Tough Claws, etc. Of course this ability would be broken with Sturdy, so in my opinion it should be banned to have Sturdy and Harvest on the same team. In the other hand, stat-raising Berries and Lum Berry would both help to get through a stall team's defense, and to not die to things like Toxic or get crippled by Burn. Starf Berry would be a problem though, because raising a random stat by 4 stages when at 50% HP, while gaining 33% HP back and having a 50% of having that berry back at the end of the turn would become a strat really hard to get past through, so I think Starf Berry should be banned to work with any of the abilities mentioned prior.
2. This combo would also allow Pokemons that are countered by a specific type to not be obligated to retreat as soon as a possible sweeper gets in the battle. Berries that reduce damage would turn x4 weaknesses into default damage, and x2 weaknesses into a x0.5 resistance. Not only that, but Cheek Pouch would allow to outheal the damage. Altough, I see a problem with this, and it's those Berries that damage the enemy depending on what type of damage they recieved. These berries would allow certain Pokemons to either become one unbreakable specific wall, or to completely cover the defense they're weak in, as these berries would make attackers take 1/4 HP just for hitting its enemy, and the Pokemon that just consumed the berry would heal 33% HP back. I'm not sure if these berries should be banned, as this strat is not OP or viable at all, but it'd be really annoying, so that'd be the council's decision if they decide to unban Harvest.
3. It's literally the only berry-based ability left to complete the combo oh my god it was so fun and it makes CurseLax viable jesus christ
I should mention that there is a specific berry that would completely break the game and should be banned immediatly, since mixed with some of the already unbanned abilities it can create infinite battles completely impossible to win. I'm talking about Leppa Berry. When used right, it becomes completely unstopabble. A combo with Fluffy + Ice Scales + Cute Charm + Sweet Veil + Battle Armor + Flash Fire is almost completely impossible to break, and I don't even want to imagine what attrocities would allow the unban of Harvest, so I think Leppa Berry should be banned. Right now.
P.D. sorry if either my grammar or my ortography is bad, I'm not a native English speaker and I'm writing this at 2 A.M. on a school night