Perhaps you are referring to:
* "Marcargo" as a misspelling of "Cargo" - This is a term used for goods being transported. There is no direct correlation to Pokemon FireRed.
* "Marcargo" as a misspelling of "March Cargo" - This could be referring to a specific event or activity related to cargo transportation in the game. However, there is no such event or activity mentioned.
* "Marcargo" as a made-up term - If this is a term you came up with, please provide more context so I can understand what you're asking.
To help me understand what you're looking for, please clarify your question and provide more details:
* What are you trying to do in the game?
* What is the context of your question?
* Is there a specific Pokemon or item you're trying to use?
Once you provide more information, I can help you with your Pokemon FireRed gameplay! 😊