>>51281539It actually has to do with throwbacks to gen 1. Red and Blue. You'll notice the trend of using red and blue colors for all generations. GameFreak started with Red, Blue and Green, narrowed it down to Red and Blue (due to production costs) but changed their minds when they really liked Venusaur's design and released Red and Green. This also partly why we got FireRed and LeafGreen and not WaterBlue. Nintendo did trademark WaterBlue and ElectricYellow though. It was also said that green was more peaceful, where red and blue would have been opposing sides. Green being more peaceful carried more weight on the decision than of originals being Red and Green, but that was a factor. Personally, I don't see fire burning grass as being any less peaceful than water putting out fire.
They originally didn't want the games to be called Ruby and Sapphire as they just did a gem name game with Crystal. Gold and Silver wasn't based on metals either but rather color, but that turned into a double meaning with the introduction of Crystal. Diamond Pearl and Platinum kept with the metals. Black and White were different. X and Y still use the red and blue colors. Z would have been green. Sun and Moon use red and blue, so do sword and shield in their colors. Scarlet and Violet, that's another red and blue.
Nintendo likely will never release a 3rd version again as consumers were waiting to buy the 3rd version as they were better. Now we get 4 games per gen instead were consumers buy 2 games per gen until SwSh went the DLC route.
I wish I could find the video that talked about this, it took from old Nintendo interviews found in japanese magazines, that had to be translated. The guy ordered an entire year's worth of the old gaming magazine just to find even the smallest things and found what he was looking for in the form of one interview in one magazine. It may have been Did You Know Gaming.