Digimon World 2/Types

All Digimon belong to one of 3 types: Virus, Vaccine, and Data. Each type has diffirent skills that are available. A balanced amount of each Digimon type will be encountered throughout the game. Types have a large influence on DNA Digivolving. The outcome of the combination depends on what type is more dominant. Data wins over Vaccine, Vaccine wins over Virus, and Virus wins over Data. The new digimon will resemble the Digimon of the more dominant type after DNA Digivolving.

Type outcome from DNA Digivolving

Virus
A common element of Virus Digimon is attacks that drain an opponent's HP and MP.

Vaccine
A common element of Vaccine Digimon is their Assist abilities to heal themselves and their allies.

Data
A common element of Data Digimon is attacks that give opponents negative modifyers like stat reductions or poisoning.