Pokemon Colors
To change pokemon color is easy, just do the following:
Use only lower caps (ie: poliwhirl)
Reverse the syllables (ie: DRILLBEE)
Abridge the names (ie: Pika)
Battle Mewtwo
To unlock a hidden 6-on-1 battle with Mewtwo, beat the Gym Leader Castle and get trophies in all 10 tournaments in the Stadium Mode. The map screen will now turn to a night scene and a bonus tournament will open up in which you battle against the psychic super Pokemon, Mewtwo (#150). Once you beat Mewtwo, you unlock a new game mode.
GB Speed Upgrades
There are two secret speed upgrades to the GB Tower Game Boy emulator that let you play Pokemon Red, Blue and Yellow at much higher speeds:
Doduo Mode: Beat the Poké Cup. Once you have won all the Poké Cup tournaments, the GB Tower changes into Doduo GB Tower and a Doduo sticker appears on the Game Boy. The Doduo upgrade doubles the speed of the game play when playing the Game Boy game on your N64.
Dodrio Mode: Play the Game Boy games at hyper speed with this alternate speed settings. To get it, you need to beat the Prime Cup (after you have already beaten the Poké Cup). You can switch between the different GB Tower speed settings during gameplay by pressing C Right.
Get Amnesia Psyduck
You have to register ALL 151 Pokemon in the Hall of Fame. Whenever you beat a tournament (or Gym Leader Castle), your six Pokemon are entered into the Hall of Fame. It doesn't matter whether you use rental Pokemon or your own, but you can't have any gaps. Once you've filled it all up, you are awarded a free Psyduck bonus Pokemon that knows the Amnesia technique.
Get Surfing Pikachu
To teach your Pikachu Surf , you need to first unlock the R-2 (Round 2) mode. Then do the following:
Enter the R-2 Prime Cup's Master Ball division (you have to beat the first three divisions first).
Assemble a team that contains a Pikachu that does not yet know Surf. You must to use a Pikachu from your Game Boy game. You cannot use a rental pikachu. Do not register your team! Pick it directly from your Game Boy cartridge. You now have to beat the Prime Cup's Master Ball division using a three-Pokémon team that always contains Pikachu. Pikachu has to be in every one of the eight battles. You are not allowed to use any continues. If you do, you won't get Surfing Pikachu. Once you have fulfilled all the above conditions and beaten the cup, you are shown an award screen with Pikachu surfing. From here on, Pikachu can use the Surf technique both in battle and during gameplay (Game Boy versions only). If you've got Pokémon Yellow, you can now play the surfing pikachu game in pokemon yellow.. Simply go to the small house on south of fushia city.
Kids Club: Hyper CPU Difficulty
To unlock this hidden difficulty setting, select a single-player game against three CPU-controlled opponents. You need to win the "Who's the Best?" challenge five times in a row on HARD difficulty. This will open up the new HYPER difficulty setting for the CPU players.
Open Up R-2 Mode
To get the secret R-2 Mode defeat Mewtwo after you have beaten the Stadium Mode and Gym Leader Castle Mode. You will now see the final credits sequence, which will unlock the harder R-2 Mode and all new battles. You can toggle between R-2 and Regular Mode at the start-up screen by pressing C-Right.
Rent Mew
Once you open up R-2 Mode, you can rent and use Mew in the Prime Cup ,but you still can't get Mew in Gym Leader Castle and Free battle.
Talking Pikachu
For a talking Pikachu, you need to upload one from Pokemon Yellow. Rental, Red, and Blue versions will not work.
Win Bonus Pokémon
Each time you beat the Gym Leader Castle (including the Final Four and your Rival), you will receive one of eight Pokémon. These Pokémon are awarded at random, so you need to beat them over and over to get all of them.
Here are the Pokémon you can win:
#001 Bulbasaur
#004 Charmander
#007 Squirtle
#106 Hitmonlee
#107 Hitmonchan
#133 Eevee
#138 Omanyte
#140 kabuto

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