>>49441066>>49441138Gen 8 launched ~20 years after gen 1. The reason they shoved gen 1 Pokemon into gen 1 and dicksucked them is simple, marketing. It wasn't that genwunners are the most profitable part of the fanbase, far from it actually, as they only pander the games to kids. However, what if you could tie those two markets together? Shove Charizard, Gengar, Machamp, etc... into a new game, fellate the shit out of them, and get a new group of kids to love them. Now you don't have to market two different Pokemon gens. You just slap Charizard on something and both your aging adult fanbase AND your fresh new fans will love it. Similarly, this is why Greninja isn't in gen 8. It was too popular and was creating a rift in marketing, so they made the decision to shove it under the rug because hooking kids on Charizard was safer. I'd bet money this was also why Ash lost in the Kalos league to Charizard X, they knew Greninja was getting to be too much and the decision to shill gen 1 to kids again was already made by that point. It's also why Charizard is a ride Pokemon in gen 7.
tl;dr, they want new kids to love charizard so marketing is cheaper, easier, and more effective