* Generation Compatibility: Pokémon Sapphire is from Generation III, while Pokémon Blue is from Generation I. These games are not compatible for trading.
* Game Boy Advance Link Cable: The Game Boy Advance SP uses a special link cable (the "Game Boy Advance Link Cable") to trade with other Game Boy Advance games. However, this cable can only be used to connect games within the same generation.
To trade Pokémon between these games, you need to follow a longer process:
1. Transfer from Blue to a Generation III game: You can use a Game Boy Advance to Game Boy Color Link Cable to transfer your Pokémon from Pokémon Blue to a compatible Generation III game like Pokémon Ruby, Sapphire, or Emerald.
2. Trade from Generation III to Sapphire: Once your Pokémon are in a Generation III game, you can use a Game Boy Advance Link Cable to trade them with Pokémon Sapphire.
Here's a summary of the cables you'll need:
* Game Boy Advance to Game Boy Color Link Cable: To transfer Pokémon from Blue to a Generation III game.
* Game Boy Advance Link Cable: To trade between Generation III games (like Sapphire and Ruby/Emerald).
Important Note: This transfer process will only allow you to transfer the Pokémon themselves, not items or other data.