This game is titled Pokemon Stadium 2 in Japan.

Amnesia Psyduck

Get all 151 Pokémon in the hall of fame.

Surfing Pikachu

successfully complete the game.

Talking Pikachu

Upload Pikachu from the yellow version of the game to Pokémon Stadium. When battling, Pikachu will say its name and have different motions for certain moves.

Note: You must go to battle for this to work. Do not register Pikachu.

Surfing Raichu

Get a Raichu that knows SURF (as seen by Surge's Raichu). It will put its tail under itself and use it as a surfboard.

Mew

Mew will become playable, as a "Rental" Pokémon, in the Round 2 version of the game. He can only be played in the Prime Cup tournament, Gym Leader's Castle, Free Battle, and Mewtwo Battle modes.

Mew in Prime Cup This trick requires a Game Boy Game Shark and Pokémon Yellow. First start the game and enable the Game Shark code to catch Mew. Put it first in your line-up, then save the game. Go to the Game Shark screen and enable the code for the first Pokémon in your line-up to be any desired Pokémon. Check your stats and it should display your selected Pokémon's picture, but with Mew's name and information. Save the game. Place the game in the transfer pak and go to the Pokémon Stadium building. When prompted to select Pokémon, choose the one that was Mew. When you start the match, the Pokémon will be Mew.

Mewtwo Battle

Successfully complete all Cups in Stadium mode, and defeat all opponents in the Gym Leader's Castle. Mewtwo is the last opponent you will face in both Round 1 and Round 2 versions of the game.

Round 2

Successfully complete the game to unlock a much harder version of the Stadium, Gym Leader's Castle, and Mewtwo Battle modes.

Kids Club Hyper mode

In one player mode with three CPU controlled opponents, successfully complete "Who's the best?" five consecutive times on the hard difficulty setting within one match. Hyper will be unlocked as a new difficulty setting for CPU controlled players.

Alternate Pokémon colors

Pokémon that you upload from the Game Boy version can have alternate colors. Giving your Pokémon various nicknames will change their colors. Switch syllables, such as calling a "Mewtwo" to "Twomew" (blue color). Separate the syllables with a hyphen, such as "Mewtwo" to "Mew-two". Also try naming the Pokémon in all lower-case characters. To find out more methods, note the color of the opposing Pokémon and look at their nicknames.

Alternate title screen

Successfully complete the Gym Leader's Castle and Stadium modes to change the title screen.

Play Pokémon faster

Successfully complete the entire Poké Cup to get a sticker on the GB Tower. This will allow you play Pokémon on the Nintendo 64 twice as fast. If you beat the Masterball in the Prime Cup, a "Superfast" setting will be unlocked in the GB Tower. The title will change to "Doduo GB Tower". Press C-Left to activate it. -From: Viper5806@aol.com

Get Pokémon presents faster

Successfully complete the Gym Leader's Castle. Then when you want to complete it again, go to the Gym Leader's Castle, go directly to the Elite 4, and defeat your rival.

Avoid recoil damage

If you use an attack that you know will kill the opposing Pokémon, but will hit you with the recoil, make sure that your Pokémon has at least 20 HP left. Use the attack and you will not suffer the recoil damage.

Trade without a second transfer pak

Put a box on the game, then put the Pokémon from a different game or the same one in the box. Then, go back to the lab and put the box back on the game that you are trading to, go to the box, and withdraw the Pokémon when you want or need it.

Note: This also works with items.

Give Pokémon to another Game Boy pak without getting one back

Place the desired Pokémon in a separate box from which you have your regular Pokémon. Transfer that box to the 64box on the Nintendo 64. Shut off the system (if you only have one transfer pak) and insert desired Game Boy pak. If you have two transfer paks, then just switch the Game Boy pak with the one you are going to trade to. Then, transfer the box with the Pokémon in it to the other Game Boy pak and you will have the Pokémon without giving one in return.

Game Shark codes without a Nintendo 64 Game Shark

The "Import" feature and import pack can be used with Game Boy Game Shark codes while playing the original game or codes designed for it.

Get Pokémon for Game Boy game

Complete one of the Gym Leader's Castles of the Elite Four or your rival to get one of the following random Pokémon that can be transferred back to your Game Boy Pokémon game: