Generation II/Advances in Gameplay/Further Additions in Pokémon Crystal


 * A female choice for the player,.
 * Animations for all Pokémon when encountered or when sent from their Poké Balls.
 * A Battle Tower.
 * A move tutor, outside the Goldenrod City's Game Corner.
 * Online capabilities of battle, trade and group, through the Pokémon Mobile System GB.
 * An event, with the Celebi encounter involving a subplot from the Pokémon Mobile System GB.
 * An event item, with the GS Ball needed in order to catch Celebi.
 * Event Pokémon caught instead of being obtained by trade.
 * Special battle music when encountering the Legendary beasts in the wild.
 * Incorporation of Legendary Pokémon into the plot.