A true Gameboy color classic. Out of the 3 gen 2 Pokémon games Crystal is always my go to choice. It has added many more colors than gold and silver as it was built for the Gameboy Color only. And more importantly the added sprite animations, a mainstay of the series until they switched to 3d models in gen 6. Help bring Pokémon more to life like never before. Add in the fact that they gave 2 new types with Dark and Steel. Added in breeding eggs, Shiny Pokémon, split special into attack and defense, allowed you to play as a girl for the first time and a day and night cycle. Plus a 100 new Pokémon and it's easy see why Crystal is many Pokémon trainers favorite Pokémon game.
Now here's what is new for the 3ds version. One they added in online and local trading and battling, yay no more link cables. The ability to transfer them to current gens via Pokémon bank. And finally they added in the Celebi event into the game, that used to be only available via special events. It's clear they took their time to make this as good of a port as possible. If you have an itch to return to the classics I can't recommend crystal version so much. -MickManga