What is the difference between crystal version silver version and gold version?

The story line in crystal is a little longer and you encounter the legendary Pokemon in a different order than gold and silver. The mascot in Crystal is Suicune, one of the three legendary dogs, and can be caught in the Bell Tower after many encounters in the region. Gold and Silver's mascots are Ho-Oh, the guardian of the skies, and Lugia, the guardian of the seas. There are also some differences in the wild Pokemon. An example is in Gold, you can find Spinarak, while in Silver, you can find Ladyba.