Here's how you obtain Digimon in Digimon World 2:
1. Finding Digitama: These are the eggs that contain baby Digimon. They can be found in various locations on the world map, often guarded by wild Digimon.
2. Defeating the guarding Digimon: You'll need to battle and defeat the Digimon guarding the Digitama.
3. Picking up the Digitama: Once the guardian Digimon is defeated, you can pick up the Digitama and take it back to your Digi-Farm.
4. Raising the Digimon: The Digitama will hatch into a baby Digimon, and you'll need to raise it, train it, and feed it to help it evolve.
Remember, Digimon World 2 has a complex world with a lot of different Digimon to find and raise! Have fun!