Alternate title screens
Successfully complete all cups in stadium mode to unlock a different title screen. Successfully complete all cups in Round 2 to unlock another different title screen.

Rival Cup
Successfully complete all cups in stadium mode and defeat all trainers in the Gym Leader Castles to unlock a special Rival Cup in the lower right hand corner of the main map. Select it to fight against Mewtwo, Ho-oh, and Lugia.

Rare Pokémon
Successfully complete the Rival Cup in Round 1 to unlock a rare Farfetch'd with the Baton Pass. Successfully complete the Rival Cup in Round 2 to unlock a Gligar with the Earthquake move.

Round 2
Win the Rival Cup to unlock Round 2.

Harder mini-games
Challenge the computer to a mini-game battle on the hard difficulty setting and win the game to unlock the super hard difficulty setting.

Super TM
Defeat the Johto Gym Leader Castle with a team of your own, with no rentals or registered Pokémon teams to be able to teach anyone in your team any move you wish to add, no matter its type.

Mystery Gift
At the main screen (with White City, Event Battle, and Battle Now), select "Mystery Gift". Follow the onscreen directions to receive a gift that can be picked up at the Pokémon Lab. You can only use this if you have either Pokémon Gold or Silver in a Transfer Pak.

Celebi as rental
Unlock Round 2 to access Celebi as a rental Pokémon in the Prime Cup competition.

Farfetch'd with Baton Pass move
Win the Rival Cup in Round 1 to unlock a Farfetch'd with the Baton Pass move.

Gligar with Earthquake move
Win the Rival Cup in Round 2 to unlock a Gligar with the Earthquake move.

More knowledge at Pokémon Academy
Finish all classes, pass all tests, and win the school battles (beat the Elite Class) to unlock more information at the Library, including all items available in all of the Game Boy Pokémon games.

Game appearances on television
In "My Room", when you have the video game consoles (NES, SNES, and Nintendo 64) to decorate your room, they will also decorate the television. For example, when you use the NES, games such as The Legend Of Zelda, Donkey Kong, Kirby, and Super Mario Bros. will appear on the television screen. For the SNES, games such as The Legend Of Zelda: A Link To The Past, F-Zero, Kirby Super Star, and Super Mario World. For the Nintendo 64, games such as The Legend Of Zelda: Ocarina Of Time, Wave Race 64, Super Mario 64, and Star Fox 64. There are no decorations for the Virtual Boy.

Light Ball
The Light Ball doubles Pikachu's Special Attack and Defense stats. You can get this by removing the items from Pikachu from Pokémon Red, Blue, or Yellow.

Thick Club
The Thick Club doubles Cubone's and Marowak's Attack power. You can get this by removing the items from Cubone or Marowak from Pokémon Red, Blue, or Yellow.

Easy Game Corner coins
Play the mini-games with any number of players while a Pokémon game is in the Transfer Pak.

Good Pokémon Team for Little Cup
Phanpy, Charmander, Totodile, Mareep, Mankey, Swinub.

Good Pokémon Team for battling the Elite Four
Tyranitar, Feraligator, Charizard, Mewtwo, Lugia, Zapdos.

Good Pokémon Team for battling Picnicker Cyndy
Granbull, Fearow, Lickitung. Lead with Granbull.

Good Pokémon Team for battling Lass Nancy
Eevee, Golbat, Noctowl. Stick with Eevee's Swift attack which never misses.

Mini-games
Have a Pokémon game in the Transfer Pak when you play the mini-games. The game will search for Pokémon that you own for use in the mini-games. Some of the Pokémon include:

Gutsy Golbat: Golbat and Crobat
ClearCut Challenge: Scyther, Pinsir, and Scizor
Barrier Ball: Mr. Mime
Topsy-Turvy: Hitmontop
Furret's Frolic: Furret and Girafarig
Pichu's Power Plant: Pichu, Elekid, and Pikachu
Rampage Rollout: Donphan
Tumbling Togepi: Togepi and Omanyte
Egg Emergency: Chansey
Streaming Stampede: Cleffa and Igglybuff
Delibird's Delivery: Delibird
Eager Eevee: Eevee