How do porygon get to the real world from the computers?
Thank you for the question! I'm sorry it took me so long to get to it, but my office hours are now open so feel free to ask any questions and I can get to them sooner!
So Porygon is made-up entirely of code which doesn't make sense because code is essentially computer language. It's as if saying a Pokémon is made up entirely of sound. It's not exactly a tangible, physical thing.
So when we think about what makes up most Pokémon (bar mythicals and legendaries) for the most part we can assume that Pokémon share the same molecular makeup as many other living things - carbon. This gets a little tricky when talking about rock or steel Pokémon like Geodude or Steelix, but let's assume that for most other types of Pokémon they are carbon-based lifeforms. But does that mean Porygon is a carbon-based lifeform?
One theory I had is that Porygon is kind of made from a 3D Printing mechanic, but in order to 3D print anything you first need a design and plastic filaments. I don't think Porygon is made up of plastic since it can freely move into and out of cyberspace. So in order for a Pokémon to be "made" it has to have some sort of physical compound that it can build itself upon, like plastic in 3D prints, or metal compounds like iron and magnesium for rock Pokémon.
Here's another kink in the gears - Porygon2 is designed to travel through space as per its Pokédex entry. Since we've already established that Porygon is almost made up of sound, Porygon2 wouldn't be able to exist in space because there is no air - and thus no sound. Coding is different than sound, obviously, but you still need a vector to relay the communication that coding is. Hardware, circuitry, anodes, motherboards, they all make up the bits and pieces of computers than allow for coding to exist. So what is coding without a computer? Well, in counties like Finland children are being taught coding in schools without computers, but it's more theoretical and logarithmic thinking (see articles here).
To answer your question, I would assume that since Porygon is entirely man-made when coding becomes cognizant, that is, the coding itself recognizes it is its own being, it can escape the virtual world and manifest itself elsewhere in the form of Porygon. I'm sure that there are many Porygon that are "bred" through computer programs deliberately by scientists, but once these Pokémon are out in the world, I imagine they can sort of asexually reproduce if they manipulate their own code enough. Any significant adjustments to their essential coding would change their makeup entirely, thus producing Porygon2 or Porygon-Z.
A very tricky question to answer, I loved it! Thank you so much!