New Pokemon came out, and so did new moves. However, these new moves aren’t just limited to generation 2 Pokemon. You will also find generation 1 Pokemon with these new moves. The old movesets, however, will now be “legacy” moves and no longer obtainable. Keep the Pokemon under the Legacy section
Keep the Pokemon under the Legacy section if you want some leverage for trading… whenever that comes out. Hardcore collectors would love to get their hands on these legacy move sets if the Pokemon they have don’t already have the moves. Not all of generation one’s Pokemon moves have been changed, so you will have to look and see if you have any of these treasures ;).