Here's how:
1. Beat the main story: This involves defeating the Legendary Pokemon that appears at the end.
2. Talk to Grovyle: After beating the main game, head back to your partner's home. Grovyle will tell you about a new threat, starting the post-game story.
3. Complete the post-game story: This involves a series of challenges and battles, eventually culminating in a final confrontation with a powerful foe.
4. Obtain the Golden Mask: Upon successfully completing the post-game story, you will be rewarded with the Golden Mask.
The Golden Mask is a powerful item that grants you significant advantages in battle:
* Increases Attack: The Golden Mask boosts the user's Attack stat.
* Grants Immunity to Status Ailments: The mask protects the user from any status ailments like paralysis, burn, or freeze.
* Reduces Item Usage Cost: The Golden Mask makes items less expensive to use.
While the Golden Mask is a powerful item, remember to prioritize collecting other important items throughout the game, such as the Rainbow Stone which is essential for evolving certain Pokémon into their Shiny forms.