Pokemon FireRed Version Cheat, Codes

Cheat: Mystery Gift
In any Pokemon Center, go to the clipboard by the shop owner and enter "Link Together With All." You will now have access to the mystery gift system.

Hint - Stronger Opposing Trainers
Use the VS Seeker to challenge trainers youve already faced to a rematch. Each route area has at least one trainer whose pokemon gain levels and evolve during the game. Here are the things that make these trainers more powerful:

Get the VS Seeker
Enter Fuchsia City
Defeat the Pokemon League
Complete the link with Pokemon Ruby and Sapphire

Hint: Version Exclusive Pokemon
These Pokemon can NOT be found in Fire Red and have to be traded from Leaf Green/Ruby/Sapphire/Colosseum:

Sandshrew
Sandslash Vulpix
Ninetales
BellSprout
WeepingBell
Victreebell
Slowpoke
Slowbro
Slowking
Staryu
Starmie
Magmar
Magby
Pinsir
Azurill
Marill
Azumarill
Mistreavious
Sneasel
Remoraid
Octillery
Mantine

Unlock Enable trading to Ruby and Sapphire
Go fix the Network Machine on Island 1. This is done by getting both the Sapphire and Ruby (in game items) and bringing them to the machine.

Unlockable: Diploma
Fill National Dex completely.