Information

In Digimon Heroes!, Digimon can have one of these attributes: The attribute determines if your Digimon has an advantage or a disadvantage towards the opponent: Also, the strength of your digimon depends on it's rarity-level. As more stars your Digimon has, as stronger your Digimon is.
 * red
 * blue
 * green
 * yellow
 * purple
 * red is weak to blue but strong against green.
 * blue is weak to green but strong against red.
 * green is weak to red but strong against blue.
 * yellow is weak to purple but strong against purple.
 * purple is weak to yellow but strong against yellow.

You can "change" the Rarity of your Digimon by Digivolution.