The combination is 16 in Roman numerals (XVI).
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It's on the brick wall to the right of VINE
in the room past where the stalagtites have fallen into the ice.
In the Pokemon League in the Champions room.
you dig it up in the top right corner of the room where you find the meat weapon in the ice castle (there is no X)
Sir Vyvin can be found on the second floor of Falador castle, to the east.