Real way to get Muk
Lots of people say that if you keep taking pictures of grimer in the cave level he will evolve into Muk.That doesnt work.(I wasted all my film there, and he STILL didn't evolve). Here is how you really get Muk. You have to take 1 picture of each of the grimer you see at the start of the level. After that you will see 2 grimers on ledges. Hit them with pester balls and he will evolve after you hit him 5 or 6 times.
Play Pokemon 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.
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 Pokemon for Game Boy game
Complete one of the Gyme Leader's Castles of the Elite Four of your rival to get one of the following random Pokémon that can be transferred back to your Game Boy Pokémon game:
Eevee
Hitmonlee
Hitmonchan
Squirtle
Charmander
Bulbasaur
Omanyte
Kabuto
Talking Pikachu
Upload Pikachu from the yellow version of the game to Pokémon Stadium. When battling, Pikachu will say it's name and have different motions for certain moves. Note: You must go battle for this work. Do not register Pikachu.
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 in 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 pack and go to the Pokémon Stadium building. When prompted to select Pokmon, choose the one that was Mew. When you start the match, The Pokémon will be Mew.
Round 2
Successfully complete the game to unlock a much harder version of the Stadium, Gym Leader's Castle, and Mewtwo battle modes.
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.
Get Surfing Pikachu
Yes, it's true: Surfing Pikachu is hidden in Pokémon Stadium. To teach your Pikachu Surf (a technique it can normally not learn), 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 HAVE to use a Pikachu from your Game Boy game. You cannot unlock Surfing Pikachu using a Rental Pokémon. 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 standing on a surfboard. 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 also access the hidden Surfing Pikachu mini-game. Simply go to the small hut on the northern beach of Route 19.
New Title Screen
Beat both the Gym Leader Castle and Stadium modes to change the title screen (in addition to the map mode). The new title shows depict Pikachu, Blastoise, Charizard, Venusaur and Mewtwo.
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