On your trip to Kalos with your trust Galar mon, you find a rock that transforms one Galar mon of your choice and grants it the ability to have a Mega Evolution. Who do you give it to, and how does the Mega improve them?

Hard Mode: Nothing with a BST of 530 or higher.
Harder Mode: Include stat buffs to things the pokemon doesn't actually need/care too much for, like typical GF Megas do.

Mega Indeedee (F)
Normal/Psychic
Ability: Psychic Surge
HP: 70
ATK: 55 -> 65 (+10)
DEF: 65 -> 105 (+40)
SP.ATK: 95 -> 105 (+10)
SP.DEF: 105 -> 135 (+30)
SPEED: 85 -> 95 (+10)

Now it's physical bulk isn't fucking garbage.