How many people do you have to trade with to get the master ball?

To obtain a Master Ball in Pokémon games, you typically need to trade with just one person. In Pokémon Ruby, Sapphire, and Emerald, for example, trading with another player who has a Master Ball is the most common way to acquire one, as it is usually a single-use item found in the game. However, in some games, it may also be obtained through special events or locations. Thus, the number of trades needed can vary depending on the specific game and circumstances.