Instructions
Insert the "Pokemon Soul Silver" cartridge into your Action Replay device. Create a new cheat called "Can Capture Trainer Pokemon." Enter the following cheat code:
9224670a 00002101
1224670a 00002100
d2000000 00000000
Activate the "Can Capture Trainer Pokemon" cheat in the Action Replay interface.
Play "Pokemon Soul Silver" and obtain the eight Johto badges and eight Kanto badges. Go to the peak of Mount Silver. Fully heal your team of Pokemon with Hyper Potions, Max Revives, Full Restores and Ethers. Walk up to Red to engage him in battle.
Fight Red and he will send out Pikachu as his first Pokemon of choice. Weaken the Pikachu with a Ground-type move, such as "Earthquake" or "Mud Shot." Burn, freeze, paralyze, poison or put Pikachu to sleep.
Avoid causing Red's Pikachu to faint. If you defeat the Pikachu, or if the Electric-type Pokemon beats you, restart "Pokemon Soul Silver" to try again. Catch Red's Pikachu with an Ultraball, Fastball or Masterball. The Masterball will catch the Pikachu immediately, while the other Pokeballs may not.