Fun Fact: although the berries with the "+1 to all stats" attribute may seem useless at first glance, there's one major benefit to them. More specifically, the purple tire/grade berries give you +1 AP which is great for dealing more damage especially with characters like Mawile who has the move Jaw Lock.
For context, Jaw lock is a move that permanently raises a random stat (Speed, Attack, Sp. Attack) by 3 (Or 5 if you upgrade) so long as it's the final blow in the room.
Side Note: Mawile's starting moves are very advantageous and
Best Moves (UPR = Uses Per Round):
Jaw Lock - Raises a random active stat by +3 when used as the final blow (Cost 5 MP, UPR 1)
Jaw Lock + - Raises a random active stat by +5 when used as the final blow (Cost 4 MP, UPR 1)
Work Up - Raises [Attack] and [Sp. Attack] by 6 (Cost 1 MP, UPR 1)
Work Up + - Raises [Attack] and [Sp. Attack] by 9 (Cost 1 MP, UPR 2)
Drain Punch + - Deals 65% of [Attack], Heals 50% of DMG dealt (Cost 3 AP, UPR 2)
Metal Claw - Deals 140% of [Attack], Increase [Attack] by +3 (Cost 4 AP, UPR 2)
Metal Claw + - Deals 155% of [Attack], Increase [Attack] by +6 (Cost 4 AP, UPR 2)
Flash Cannon, Rock Smash, Iron Tail, Crunch - Can Decrease [Resistance]
Flash Cannon = -5% Resistance -> [Sp. Attack] (Cost 4 AP, UPR 2)
Rock Smash = -5% Resistance -> 120% of [Attack] + 50% of [Resistance] (Cost 3 AP, UPR 2)
Iron Tail = -10% Resistance -> [Attack] + [Resistance] (Cost 5 AP, UPR 1)
Crunch = -8% Resistance -> 140% of [Attack] (Cost 4 AP, UPR 1)