← The Tamers

Leomon: evolution tree

Fresh -> In-Training -> Rookie -> Champion -> Ultimate -> Mega -> Ultra hierarchy, with the Reference Book's Punimon and Tsunomon before the D-Power line from Elecmon to SaberLeomon, the BanchoLeomon and IceLeomon branches, the Digimon Fusion MadLeomon and its Armed Mode Jogress, and the X-Antibody forms.
Digivolution triggers

MadLeomon Armed Mode: Jogress partners

MadLeomon absorbs Chikurimon, Troopmon and Mammothmon soldiers (Digimon Fusion)
Chikurimon
Chikurimon
Rookie
+ MadLeomon = Armed Mode
 Troopmon
Troopmon
Champion
+ MadLeomon = Armed Mode
 Mammothmon
Mammothmon
Ultimate
+ MadLeomon = Armed Mode
Names link to DigimonWiki/Fandom (Fandom community, CC BY-SA unless noted otherwise); artwork © Bandai, via the official Reference Book and Wikimon. Card labels show Level (+ X); edge colors show the digivolution trigger. In Tamers, Jeri's Leomon never digivolves; Elecmon, GrapLeomon and SaberLeomon are its line in the D-Power V-pet, and the Reference Book puts Punimon and Tsunomon before Elecmon. Adventure's Leomon warp-digivolves into SaberLeomon (episode 47), skipping the Ultimate, so the scene has no arrow. MadLeomon is a Leomon corrupted by the Bagra Army, and it returns to Leomon in Digimon Fusion episode 29. Only games link Leomon to BanchoLeomon; the tree keeps the link, the way BanchoLillymon's profile ties it to Lillymon.
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