Mega Gyarados Raid Day Ultimate Pass Box is a special box in Pokémon GO that is typically used for events related to Mega Gyarados Raids. Players can obtain this box by purchasing or participating in events. The box usually contains the following:

Possible Contents:

1. Mega Gyarados Raid Pass: Used to participate in specific Mega Gyarados raids.

2. Items:

   • Ultra Balls

   • Max Potions

   • Stardust, enhancement items, etc.

3. Limited-time items or skins: For example, special clothing, hats, or unique items for Pokémon.

4. Other items: Such as Incubators or Lucky Eggs.
   5. Each account is limited to one purchase.