No matter what three Digimon you start out with, all of them can learn the same Digivolutions. The difference is with the requirements for the Digivolutions. For example, Omnimon is a very powerful Digimon, and is required to get another strong Digimon, Imperialdramon Paladin Mode. All eight Digimon can Digivolve into both Omnimon and Imperialdramon PM, but Agumon and Veemon can digivolve into the two easier because they are both a base digimon of Imperialdramon or Omnimon.