Sorry to disappoint but Darkrai isn't the "satan" Pokemon. Giratina is.. Why?
Lets take a look.
How many horns does Giratina have on its wings? 6.
How many legs does Giratina have? 6.
Around its neck, The "rib cage" How many "ribs" does it have? 6. I believe that would be the number of the beast.
In its origin form you can also see that Giratina has horns down its tail, And how many? 6.
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Just thought id clear something up for you.
Sincerely, Pokemon nerd.