Tips on breeding, capturing, raising, and training your new Pokémon.Off the top of my head I can recall: Pokemon sprites were animated for the first time.
Otherwise yes, Crystal does a lot of polish that makes Gold and Silver look outdated. Even if youve never touched Pokemon, Gold and Silver is a must-play. About the only thing that prevents Gold and Silver from becoming totally obsolete is the fact that they have version exclusive Pokemon that Crystal doesnt. Gold and Silver are really good RPGs, and a lot more polished than the original Pokemon games were.