You have to make Cherrim learn and use the move Sunny Day in battle in order for it to transform...
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its like castform keep it from being sunny
Cherrim Overcast Form is a Blossom Pokemon. It has the flower gift, which multiplies its attack and defense.
cherrim, evolved form of cherubi.
Use a move like sunny day, or use Groudon (for drought) to make it sunny. Then Cherrim will transform.
How do you get a cherrim in Pokemon diamond.