Unlike in Pokémon Gold and Silver, the Legendary Beast Suicune appears in various locations around Johto. Once Suicune has been met in all these locations and the Clear Bell is obtained from the Radio Director in Goldenrod, the player can meet Suicune in the Tin Tower. Suicune will not flee this battle. The other two Legendary Beasts, Raikou and Entei, are unchanged and still roam Johto. Lugia and Ho-Oh can be obtained in this game, however, they both appear at Level 60, and Ho-Oh cannot be caught until all three Legendary Beasts have been.
A new character called Eusine is introduced as a pseudo-rival to the player. He is seeking Suicune and will fight the player to earn Suicune's respect.
The Ruins of Alph contained more common Unown and had a new subplot, where completing puzzles allowed the player to find hidden messages left by the Unown.
Trainers who call using the cell phone may now offer the player items or information on in-game events. They now also have distinct personalities.
A new radio show, Buena's Password, was added. By remembering a specific password used on Buena's show, the player can talk to her in the Radio Tower and receive points. These points can be redeemed for prizes.
The Dragon's Den has been expanded and the hut is now enterable. To receive the Rising Badge, the player must chase Clair to the den after the battle and speak to the Dragon Clan elder, Clair's Grandfather. He quizzes the player and if all answers are correct, the player will obtain the Rising Badge and a Dratini that knows Extreme Speed.
- 037 Vulpix Silver
- 038 Ninetales Silver
- 056 Mankey Gold
- 057 Primeape Gold
- 179 Mareep Gold/Silver
- 180 Flaaffy Gold/Silver
- 181 Ampharos Gold/Silver
- 203 Girafarig Gold/Silver
- 223 Remoraid Gold/Silver
- 224 Octillery Gold/Silver
Elite Four and Champion
- Pokémon Crystal was the first game to feature semi-moving Pokémon sprites. This later appeared in Generation III and the Generation IV games. It was then transitioned fully to full moving Pokémon sprites in Generation V, followed by 3D models in Generation VI and Generation VII.
- Pokémon Crystal is the first Pokémon game to offer a choice between a male and female player character.
- As of January 2018, Pokémon Crystal is now, just like all the other core series game that is able to connect with an transfer Pokémon to the Generation VII core series games.