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Mega Cherrim:
Grass/Fire type
Ability: Flowergift
HP: 70
Attack: 100 (+40)
Defense: 85 (+15)
Special Attack: 90 (+3)
Special Defense:100 (+22)
Speed: 105 (+20)
For the uninitiated, Flower Gift gives 1.5x attack and special defense in sunlight. This thing will have a whopping 150 attack stat in sunlight. The only thing holding it back is needing to set up sunlight, and its pathetic physical movepool which can be supplanted with some special moves.
Weatherball (100 BP in sunlight)
Sunny Day
Petal Blizzard
Growth
Now, if it actually got some good moves, then it would be able to stomp OU, but the shitty movepool keeps it lower.