Joe obtains the Crest of Reliability. His digimon partner is Gomamon.

Pichimon (fresh level)

Digivolves to...

Bukamon (in-training level)

Digivolves to...

Gomamon (rookie level)

Digivolves to...

Ikkakumon (champion level)

+ =
Digivolves to...

Zudomon (ultimate level)