Trading Pokémon between the original Pokémon Red and Blue versions is a straightforward process, but to ensure a successful trade, several conditions must be met. Here's a step-by-step guide on how to trade between these classic games using a Game Boy link cable: 1. **Check Your Hardware**: First and foremost, you need two Game Boy devices and a functional Game Boy link cable that's compatible with them. These are the hardware requirements for trading. 2. **Prepare Your Pokémon Game Cartridges**: Insert the Pokémon Red cartridge into one Game Boy and the Pokémon Blue cartridge into the other. 3. **Save Your Game**: Make sure you save your game progress on both devices. Trading won't be possible if you have not saved the game after catching or receiving your Pokémon. 4. **Go to a Pokémon Center**: In both games, visit any Pokémon Center. On the second floor, you'll find a room for Link Cable Battles and Trades. 5. **Talk to the Trade Center NPC**: Once on the second floor, speak to the character who is standing by the door of the Trade Center. This will initiate the process to enter the trade room. 6. **Connect the Link Cable**: Before proceeding through the door, connect the two Game Boys using the link cable. Ensure that the cable is properly connected to the link port on each Game Boy. 7. **Enter the Trade Center**: With the link cable connected, proceed through the door in both games. The game will confirm that the cable is connected, and you will enter the trade room. 8. **Initiate the Trade**: On both devices, walk up to the Trade Center's counter, where your game character will be prompted to sit down. Once both players are seated, the trading interface will appear on the screen. 9. **Select Pokémon to Trade**: Each player can now select the Pokémon they wish to trade from their respective teams or storage boxes. Navigate to the Pokémon you want to trade, select it, and confirm your choice. 10. **Trade Confirmation**: After both players have selected their Pokémon, a confirmation message will appear. If both players agree to the trade, select ‘Trade’ to proceed. 11. **Complete the Trade**: The screen will show the Pokémon being traded between the devices. Once the animation is complete, the trade is done. The new Pokémon will appear in your respective teams or storage boxes. 12. **Disconnect Safely**: Before unplugging the link cable, make sure to exit the trade screen and save your game to ensure that the trade is recorded properly. Please keep in mind that certain Pokémon cannot be traded if they are holding certain items, or if they know specific moves that are exclusive to one version of the game. Also, Pokémon that evolve through trading will do so immediately after the trade completes, so make sure you're ready for their evolution. By following these steps, you should be able to trade Pokémon between Red and Blue versions seamlessly. Remember that these instructions are specific to the original Game Boy games and may not apply to later remakes or console variations.