Game Freak/Nintendo rarely retcon anything, but if they could, what retcons would you like to see?
My list is below
*Merge Nidoran(M) and Nidoran(F) into one Pokemon but with Gender differences, so they count as one rather than 2 still keep the split evos.
*Fix the national dex so that all families are together rather than split by evolution, so bring Pichu just in front of Pikachu.
*Also rearrange Mew so that it becomes before Mewtwo in the dex.
*Retcon the incense out of existance, so just make a Sudowoodo egg automatically into a Bonsly you don't need to explain why this couldn't be done before, just retcon it.
*Also fix some of these dodgy evolution methods, you did it with Feebas -> Milotic, now make Espeon use Sun Stone, Umbreon Moon Stone, Leafeon Grass Stone, and Glaceon some Ice stone. These are just examples, there are lots of other dodgy evolution methods i;d fix (level up with Ancientpower which can only be reached with move relearner???)
More to follow...