After you have fought Ogremon in Great Canyon Top Area and Ogre Fortress, see if Yuramon tells you about a gigantic Digimon which often appears in Freezeland icebergs. If it does, go to Freezeland. Go north, north, east, south, southwest, south from the screen when you first enter Freezeland from Great Canyon Top Area and you should see him. Talk to him until you see two options given by him. Select "I'll help you" and he will carry you to the Secret Beach Cave. Fight Ogremon there with his two partners, Gabumon and WaruSeadramon. Be careful though -- WaruSeadramon is very strong, and its Aurora Freeze attack is powerful. You should bring a lot of recovery items or you will lose. After you defeat those bandits, go to the previous screen (your character will probably walk by himself) and you will see Ogremon there. He joke that he is going to the city, but he will not. He will escape from you again using something like an underwater capsule. After that, Whamon will want to join the city and the game will ferry you back to Freezeland, to the place where you first encountered him. You can find him in File City near the soil where Tanemon planted its Rain Plant Fruit. He will be able to ferry you to the Secret Beach Cave and Factorial Town.