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Biyomon: evolution tree

Fresh -> In-Training -> Rookie -> Champion -> Ultimate -> Mega hierarchy, with the X-Antibody line, the dark bird branch (Saberdramon / Karatenmon), the Ornismon variation and the collective composition that forms Omnimon Merciful Mode.
Digivolution triggers

Collective composition (Adventure tri.)

Phoenixmon 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
 Vikemon
Vikemon
Mega
Beast warrior 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. Ornismon is an alternate Virus (Ancient Bird) Mega off Garudamon. Omnimon Merciful Mode is a collective composition (Adventure tri.): Phoenixmon plus Omnimon, Rosemon, HerculesKabuterimon, Vikemon, Seraphimon and Magnadramon.