Going to point out the batteries in Red & Blue are dead for most people. Silver and Gold will be pretty soon. Games will play but saving is impossible.
I don't know about the rest. I would hope the method used to save had been improved by Rudy and Sapphire but it may not have been. Cartridge batteries last about 10-12 years as I understand it. Roms are a better bet with the older games at this point.