Starter Digimon
Depending on the version of the game being played, players automatically begin with whichever lead Digimon is exclusive to their version, plus two Digimon from the respective packs chosen. If the player is playing Dusk, the starter Digimon is Lunamon, and the Digimon from the packs are: Gaomon and Solarmon (Balanced pack); BlackAgumon and Goblimon (Attack pack); Tentomon and Keramon (Defense pack); or Bearmon and Palmon(Pretty pack). If the player is playing Dawn, the starter Digimon is Coronamon, and the Digimon from the packs are: Agumon and Salamon (Balanced pack); Guilmon and SnowAgumon (Attack pack); Muchomon and Monodramon (Speed pack); or Kudamon and Biyomon (Japanese pack).
In each version the Digimon start of at Ultimate level (excluding Lunamon or Coronamon). But the tremor causes your Digimon to degenerate into the above Digimon.
Read more about this topic: Digimon World Dawn And Dusk