Chapter 1: The Adventure Begins

Deep in the "Mysterious Caves" on the 20th floor, Metagross was looking for some power stones to increase his power even more. He stopped to rest because he had to fight off over 30 Pokémon on his way up. Meanwhile in the future...Celebi found a lost Cyndaquil and decided to rescue him because of her good nature. They had to escape fast or else Dialga would capture them. Celebi opened a time portal and Cyndaquil said "Hurry Celebi, there isn’t enough time"!!! Celebi got caught by one of Dialga’s henchmen Dusknoir. "Run Zack" said Celebi. Zack jumped through the portal after grabbing his bag and went through time with his partner Mudkip. Mudkip's hand slipped 30 seconds after going through the portal. Zack landed hard in front of Metagross. Metagross awoke and was going to use Geo Impact on Zack but then Zack said "wait"!! Metagross stopped the attack and asked Zack where he came from; Zack told him everything that happened. Metagross said "oh". Zack said "What"? Metagross said "come with me". Metagross grabbed his bag of power stones and Zack grabbed his bag and they used an escape orb. Metagross told Zack to stay in his house for the night so he’d be safe and that everything would be sorted out tomorrow.
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Chapter 2: Getting Prepared
The next day, Metagross came in shouted “Wake up Zack”! When Zack awoke, Metagross said “Lucario, our town leader wants to see you immediately”. Metagross took Zack to Lucario. “Come here Zack” said Lucario. Zack came up to Lucario and asked “How did you know my name Lucario”? “Metagross told me everything that happened” said Lucario. “Am I in trouble”? Asked Zack. “No, you’re not in trouble” said Lucario. “Phew, I thought I was trouble” said Zack. “Let me give you your supplies” said Lucario. “Oh, I got some supplies” said Zack. Then Zack emptied his bag and an apple, firestone, and a round glowing black stone rolled out of his bag; “I’ve saw this before but only once, but I forget what it does, Alakazam might know what it does but he disappeared and no one saw him again” said Lucario. “Where did you get this”? Asked Lucario. “My Brother who is a Typhlosion gave it to me” replied Zack. “Oh, keep this firestone for when you’re ready to evolve” said Lucario. “Ok” said Zack. “Here, eat the apple” said Lucario. “Ok, I am kind of hungry” said Zack as he ate the apple. “Here’s your Explorer Bag, you use it for items you find on your adventures like: food, orbs, stones, etc.” said Lucario as he gave Zack his bag. “You can have the house that Metagross and his Metangs built for you” said Lucario. “Thanks" said Zack as he went to sleep at his new house.
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What does the Black Stone hold inside of it and Will Zack find Mudkip?