Looking at the string you can see that the numbers starting with 5 are exactly where numbers would fall in the passcode format. Here’s some Niantic math at work, first step is that the first digit of every number will be used as the first digit of the Ascii value. The next digits are to be divided by the first digit to give you the rest of the answer. Oh and if your answer is 14 simply add a 0 to make 104. Not clear? Here’s the full answer.

119 99 112 50 53 104 101 108 112 55 51 57 109 111

Convert decimal to Ascii

wcp25help739mo

We have those numbers starting with 5 in the right place for the numbers in the passcode format. This should mean that first digit of every number is good for Ascii. Now we need to find the second digit of the Ascii values.

Notice how the rest of the digits for every numbers are always higher than the first one? You’ll need to do subtractions for this one

71 83 78 52 50 82 69 68 85 67 69 52 53 56 85 86

Convert decimal to Ascii

GSN42REDUCE458UV

Again those 05 when you use _ as a split fall right where the numbers should be in the passcode format. This one is all written out for you on what you have to do. Here’s how

85 88 85 52 54 66 69 78 53 55 50 77 79

Convert decimal to Ascii

UXU46BEN572MO