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It's based on Wikipedia's list of New/Total Pokemon for each game. I'm assuming it doesn't include regional forms, only new Pokemon species (though I don't know for sure - however Wikipedia users have counted them). I decided not to make a new data-point for the "mid-generation releases" (i.e., Ultra Sun/Moon, Let's Go Evee/Pikachu, the Sword/Shield DLC), however whenever the next generation releases the new "total" count DOES count all of those mid-generation releases. Sorry if that's confusing, but for example, I have a datapoint for release of Sun/Moon with total Pokemon up to that release, and the next datapoint isn't until the release of Sword/Shield, but the new total also includes the new Ultra Sun/Moon Pokemon and Let's Go Pokemon.
I decided to do it that way because having those datapoints with only 2-5 new releases that are a year apart I think changes the trendline alot when the vast majority of new Pokemon occur at the start of a generation, usually around 80-100, every three years or so. Also, this small trickle of "mid-gen 'mon" seems to be a very recent thing, so I didn't want it to mess up the fitted trendline.
Just to clarify, since we're projecting trendlines into the future, the actual overlap will happen well past the current total number of Pokemon (895 with current DLC) at a projected number of 1171. The actual number will very heavily depend on however Pokemon were released in whatever future game is released before that. It could even happen that they run out of Pokemon, but the next game releases sometime later and they get enough new Pokemon to catch up.
This is mostly just a fun thing that I wanted to test a few years ago so I've kept it updated every few years. I found it really interesting that the amount of Pokemon release over time is fairly stable, and since the Podcast schedule is also very regular (once a week), it makes it very clear that the Podcast will eventually overtake the Pokemon.