Instructions
Play the game until you defeat the Tyrannomon during the "Bronze Trainer" quest. After this battle, you will be able to travel to Sheer Valley.
Go to Sheer Valley and travel down the path. Avoid the first ladder you see, but climb the second ladder. Take the first and second lefts you see at the top of the second ladder, and follow the path until your reach Pandamon.
Answer Pandamon's two questions to receive the fake Digi-Egg. The answer to the first question is "red." The answer to the second question is "Gatamon."
Travel to the Drain Tunnel after going to the Chrome Mine and realizing your Digi-Egg is fake. Travel through the Drain Tunnel by finding and turning off the valves with the "A" button. This will remove any running water obstacles that block your path.
Find the Platinum Sukamon at the end of the Drain Tunnel by using any water or lightning type attacks against him. After defeating him, you will receive the real Digi-Egg of Miracles.