The Ideal Candidate:
* Dialga/Palkia: These legendary Pokémon are crucial for completing the game's main story and are extremely difficult to catch without the Master Ball. Their capture rates are incredibly low, making the Master Ball virtually guaranteed success.
Other Considerations:
* Rarity and Difficulty: The Master Ball is best used on Pokémon that are very difficult to catch or exceptionally rare. This could include:
* Other legendaries: Giratina, Heatran, Cresselia, etc.
* Shiny Pokémon: Finding a Shiny Pokémon is incredibly rare, and using a Master Ball to guarantee its capture could be justified.
* Personal Preference: Ultimately, the choice is yours! If you want to use the Master Ball on a Pokémon that is particularly meaningful to you, or one you simply want to have in your party, feel free to do so.
What NOT to Use the Master Ball On:
* Common Pokémon: It's wasteful to use a Master Ball on a Pokémon you can easily catch using regular Poké Balls or other types of balls.
* Early Game Pokémon: Save the Master Ball for later in the game when you encounter Pokémon that are significantly harder to catch.
Remember: The Master Ball is a one-time use item, so use it wisely!