Earl of Lemongrab 3 vs Gen Narumi: who would win?

Gen Narumi favored — Favored (~65%)

Earl of Lemongrab 3 · Adventure Time · Base

Tier
HIGH 7-A
Attack Potency
Large Mountain Level
Speed
Superhuman
Durability
Small Building Level, up to Large Mountain Level

Gen Narumi · Kaiju No. 8 · Numbers Weapon Suit

Tier
7-A, up to HIGH 6-B
Attack Potency
Mountain Level+, up to Large Country Level
Speed
High Hypersonic+
Durability
Mountain Level+, up to Multi-Continent Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.