They befriend them I guess. It does have to do with their digi-vices and such, but they're never really captured.
Like I remember how Ruki ( Rika ) met Renamon. It was like many digimon wanted a strong tamer like her and then Renamon came and told her - you wanted a strong digimon, I am that digimon. ( Something in the lines of that, don't remember exactly )
They befriend them I guess. It does have to do with their digi-vices and such, but they're never rea