It's very simple, you just need to use Normatt's PakEditor tool to edit the text directly from the MESPAK00.PAK file (don't forget to save).
I don't know how to thank you Pious, that what I was looking for months, till I said I have to reverse Kaido's tool uncompress routine!!
I found some stuff in memory, now I can make them permanent, I have some ideas like inserting custom digimon, manipulating digivolution trees, etc..
once I'm ready I will dig deeper & open discord channel, some people will be interested, perhaps we can work together
very thanks to legend Normmatt, I wish one day to get to his level!!!
now it will be open for romhackers!!