@Riddler_Khu This might be the hint that the riddle is a combined cipher of Vigenere Cipher (key: khu) + Caesar (key: 6)
I also guess that FXJYKTY'J = POKEMON'S,
but non of those helpful yet
@Riddler_Khu The most frequent letter is "J",24%
But look at the words: "JIJ" "JXI" "UJXJ", I could not find any substitution table which meet all the above words.
Other starting points might be (1) The standalone character "S" (2) The contraction "FXJYKTY'J" but non of them helpful for now
@Riddler_Khu Some initial ideas here:
(1) It is not Caesar Cipher (shift), all 26 keys does not work
(2) It might be the Monoalphabetic Substitution Cipher
where each letter is substituted by another. But I barely have no further ideas: (cont.)
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