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Tentomon: evolution tree

Fresh -> In-Training -> Rookie -> Champion -> Ultimate -> Mega hierarchy, with the Red and Blue MegaKabuterimon branches, the HerculesKabuterimon X-Antibody form, the AncientBeetlemon ancestral link and the collective composition that forms Omnimon Merciful Mode.
Digivolution triggers

Collective composition (Adventure tri.)

HerculesKabuterimon 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
 Phoenixmon
Phoenixmon
Mega
Holy bird 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. Kabuterimon branches into the Red (Adventure) and Blue MegaKabuterimon, both of which reach HerculesKabuterimon. AncientBeetlemon is a Legendary Warrior of Thunder ancestral (lore) relation, not a direct path. Omnimon Merciful Mode is a collective composition (Adventure tri.): HerculesKabuterimon plus Omnimon, Rosemon, Phoenixmon, Vikemon, Seraphimon and Magnadramon.