Agumon and Biyomon
They are just normal Digimon friends. There is nothing more between them. They both are more interested in their partners. Biyomon is like Sora - nice,
helpful, everyone likes it ... And Agumon is kinda like Tai. There is no difference between Biyomon's and Agumon's relationship and their relationship with
other Digimon. They are all just good friends. Maybe Biyomon spends more time with Palmon or Tentomon and Agumon with Gabumon and Patamon (especially after episode
22, where there is just them of all other Digimon). If Sora and Tai were together, Agumon and Biyomon would probably have a different relationship. There is nothing
more to say here. After the DigiDestined in the last episode went home all their Digimon probably split apart, because they are in different parts of the Digiworld
in season 2. So did Agumon and Biyomon.