What accuracy would this move be if its accuracy is lowered by 1?

Question

If a Morelull uses Flash on a Elgyem with Hidden Power (100% accuracy), knowing that Flash lowers the opponent's accuracy by 1, what accuracy would Hidden Power then have?

Answer 1

Astronautical's answer is incorrect. Accuracy and Evasion are not modified the same way as the other five stats. These are the multipliers.
Stage Multiplier
+6 9/3
+5 8/3
+4 7/3
+3 6/3
+2 5/3
+1 4/3
0 3/3
-1 3/4
-2 3/5
-3 3/6
-4 3/7
-5 3/8
-6 3/9

Assuming no other modifiers to accuracy or evasion, hidden power's 100% accuracy is lowered to stage -1, which multiplies its accuracy by 3/4. The resulting accuracy is 75%.
source

Comments

Is it my fault I took "stats" to include accuracy and evasion? It's a simple mistake to make.

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Thank you sumwun (and Astronautical for answering too)! I knew something was fishy about those stat multipliers!