Pokémon - Red Version

Un-available Pokémon:
The following Pokémon can't be captured in the Red version of the game.

Sandshrew / Sandslash
Vulpix / Ninetales
Meowth / Persian
Bellsprout / Weepinbell / Victreebel
Magmar
Pinsir

Pokémon you can Buy:
The following Pokémon are available in the Red version at the Exchange Center

Abra / 180 Coins
Clefairy / 500 Coins
Nidorina / 1200 Coins
Dratini / 2800 Coins
Scyther / 5500 Coins
Porygon / 9999 Coins

Glitch: Longer life:
Find a Pokémon over level 100, and use rare candies until it reaches level 255. Store it in Bill's PC, and take it out later. The game will show that it has gone down some levels but has 999/437 life. It's life is now twice as long as normal. Note: This may work better with Snorlax.

All Pokémon (Japanese version):
Note: This code requires two Game Boys, a link cable, and the red and blue versions of the game. Begin game play and find your first monster. Locate the Charmanders field and capture one of them. Link both Game Boys and rapidly and repeatedly use the "Trade" option. All 150 monsters should now be available.

Raise your Pokémon to level 100 (Japanese version):
Go to the seventh item in "Tools" and press Select. Get into a fight, then press Select on the attack you dislike to change it. Note: The monster must have all four attack spaces filled. Win the fight. Your monster will become level 100 and will enter the next stage of its life, if available.

Pokémon Hints - all colors
Pokémon HM & TM List and Locations