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I don't really know, as I've never used it there, but bulbapedia tells me that Secret Power's effects are:
In tall grass: sleep
In sand: decreases accuracy
Rocky areas or caves: flinches
In water: lowers attack
In snow or ice: freezes
On plain areas or in buildings: paralyzes
In ashy areas: poisons
Using this, you can probably take a good guess at each location.
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