Pokémon Gold and Silver/New Stuff

Pokémon Gold and Silver introduce:


 * 101 new Pokémon to the game
 * A day and night system
 * Days of the week
 * A phone
 * A radio
 * Colour
 * Pokérus
 * Many new moves
 * The dark and steel type of Pokémon
 * A Pokégear (with a built in map)
 * Roaming Pokémon e.g Suicune
 * Decorating your room
 * Hold items
 * Evolution by holding an item
 * Clocks
 * Registered Items
 * Printing (from The Game Boy Printer)
 * Lottery Corner
 * Apricorns (special Pokéballs)
 * Pockets in the bag
 * Pokémon Eggs
 * Mystery Gift (via infra-red)
 * Shiny Pokémon
 * Pokérus

New features in Crystal include:


 * Animated Pokémon graphics
 * A choice of Boy or Girl
 * New Suicune quest
 * New Ruins of Alph Quest
 * A new Battle Tower located west of Olivine city
 * New ways to get Ho-oh and Lugia
 * Features Suicune(Gold features Ho-oh and Silver features Lugia)
 * Many Pokémon have move changes
 * Day care lady gives you an Odd Egg, Pokémon in it has a special move as well as a 50% chance of being shiny
 * When you enter a certain area, a sign will appear at the bottom of the screen telling you where you are
 * New Mobile Adapter (only for japanese version)
 * A way to get Celebi using the GS ball (only for japanese version)
 * Features the very first Move tutors
 * New function in the Pokegear called Buena's Password
 * Trainer's calls are now more detailed, and won't always ask to battle
 * Some trainers will give you evolution stones for free if they call you
 * A new pokeseer appears in Cianwood city, he takes a picture of your Pokémon that you can print out
 * In-game trades has been changed
 * Graphics in caves has been updated, Ice cave and Dragon's den's graphics have been updated quite a bit, as well as the new Battle Tower