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I'm a newbie to ROM Hacking, save editing, Pokémon modding and stuff so this is my very first project on the topic. I got fascinated on the old Mew/Celebi special distribution machines and I didn't find much about them during my internet search, just some information about past events that used these machines and how the distributed Mews were. Then I found the Pokemon GEN1 YOSHIRA Mew Red Distribution Cart Save File from Digiex community and decided to go on a trip to learn more about these editing stuff: Making my own Mew Machine script. The idea was simple, generate a valid Mew on an empty party slot of a save file. I used a YOSHIRA Mew from the previously mentioned save file as a base to build a YOSHIRA Mew generator function, that would return the same Mew each single time, but just with a random Trainer ID from 0 to 65535. During this process I learned a lot about how Pokémon R/B read and write to SRAM and it was cool to see the project leaving my imagination. I wish I had a Gameboy and a Gen I cartridge so I could invest on making this project better by creating even a full homebrew reproduction of the hardware with the whole interface and gameboy cartridge slot thing. Keep in mind that if you are planning to use this tool, please keep a backup of your progress. I do not want to be responsible for damages to your save file or even your cartridge. So, the link to my code is here: guilherssousa/mew-machine: A Python recreation of the Mew Machine software. (github.com)

It won’t matter in terms of the Pokémon if you change your TID/SID after you caught them. However after you change your TID/SID all the Pokémon you previously obtained will be considered outsider Pokémon (ie like if they were obtained from a trade), you can read how it’d affect you here https://m.bulbapedia.bulbagarden.net/wiki/Outsider_Pokémon. No problem for the questions, I’m quite familiar with but only decently knowledgeable on Gen 4 RMG so I would suggest you ask if changing your TID/SID via PKHeX is something that’s recommended in the Pokémon RNG communities (their subreddit and/or discord).