My friend sent me three texts asking me to solve a puzzle.
Can you shed some light on it?

Text 1:

First you have to unlucky it
Then you have to transform it
But if you get some Gibberish by matching it
Just take one step down from it
Then you must say "I have found it"

Text 2:

ZQKIV ZPPPK IVVV PZKKV ZZPQK PPKVK KIV ZZPPKKV YVV ZPZKVV PYIV ZZKK

Text 3:

.. .. .. .. . . .. .. .. .. . .. .. .. . . .. .. .. . .. ..

I got it and replied to him. What was my reply?

[Note : If you get the puzzle and found some tags missing or unnecessary feel free to add or remove them]

You replied:

I Have Found It 😊

First you have to unlucky it:

Hints at a ROT13 transformation.

Taking Text 2:
ZQKIV ZPPPK IVVV PZKKV ZZPQK PPKVK KIV ZZPPKKV YVV ZPZKVV PYIV ZZKK

And applying ROT13 gives:
MDXVI MCCCX VIII CMXXI MMCDX CCXIX XVI MMCCXXI LII MCMXII CLVI MMXX

Then you have to transform it.

The most striking thing is these are Roman numerals, so converting to decimal gives:
1516 1310 8 921 2410 219 16 2221 52 1912 156 2020

Using Text 3 as a guide to align the previous string, we get:

.. .. .. .. . . .. .. .. .. . .. .. .. . . .. .. .. . .. ..
15 16 13 10 8 9 21 24 10 21 9 16 22 21 5 2 19 12 15 6 20 20

Treating this as letter indices:

A = 1, Z = 26

we get:
O P M J H I U X J U I P V U E B S L O F T T

But if you get some Gibberish by matching it Just take one step down from it

Applying ROT25 (one step down), we get:
N O L I G H T W I T H O U T D A R K N E S S