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Gold >The aroma that rises from its petals contains a substance that calms aggressive feelings.
Silver >Meganium's breath has the power to revive dead grass and plants. It can make them healthy again.
Crystal >Anyone who stands beside it becomes refreshed, just as if they were relaxing in a sunny forest.
Flower Veil >Ally Grass-type Pokémon are protected from status conditions and the lowering of their stats. (Including the user)
If GF gave this thing Flower Veil as an ability would it finally be good? IDK
The other problem is that aside from Swords Dance, Meganium doesn't have any moves to set up with. No Calm Mind, no Nasty Plot, no Growth, Quiver Dance is out of the question, not even Agility. You're stuck with Swords Dance with Petal Dance as your highest physical STAB.
I don't even like the Meganium, but I know it deserves better than this