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Gomamon: evolution tree

Fresh -> In-Training -> Rookie -> Champion -> Ultimate -> Mega hierarchy, with the X-Antibody branch (Gomamon X) and the collective composition that forms Omnimon Merciful Mode in Adventure tri.
Digivolution triggers

Collective composition (Adventure tri.)

Vikemon joins Omnimon and the other partners' Mega forms to compose Omnimon Merciful Mode
Omnimon
Omnimon
Ultra
Royal Knight core
 Seraphimon
Seraphimon
Mega
Angel (holy) member
 Magnadramon
Magnadramon
Mega
Holy dragon member
 Rosemon
Rosemon
Mega
Fairy / plant member
 HerculesKabuterimon
HerculesKabuterimon
Mega
Insect titan member
 Phoenixmon
Phoenixmon
Mega
Holy beast member
Images and names link to DigimonWiki/Fandom. Credit and license: Fandom community, CC BY-SA unless noted otherwise. Card labels show Level (+ Virus / X); edge colors show the digivolution trigger. Omnimon Merciful Mode is a collective composition (Adventure tri.): Vikemon plus Omnimon, Rosemon, HerculesKabuterimon, Phoenixmon, Seraphimon and Magnadramon.