>>23604798They already ignored Yellow in Gold and Silver.
You also forget the fact that Yellow was only developed and released after Gold and Silver were delayed, which explains why movesets, player and rival sprites, etc. match those of Gold and Silver. Red was always planned for the sequels of Red and Green and there's Sugimori artwork of Red and Pikachu from 1996, long before the anime and Yellow, which respectively came out on April 1997 and September 1998, while Gold and Silver were originally scheduled for March 1998 and without Yellow ever being a thing.
