Evil Dragon vs Gatling Pea: who would win?

Evil Dragon favored — Slight edge (~55%)

Evil Dragon · Touhou Project · Full Power

Tier
2-C
Attack Potency
Low Multiverse Level
Speed
Below Average Human, up to Omnipresent
Durability
Low Multiverse Level

Gatling Pea · Plants vs. Zombies · Garden Warfare - Battle for Neighborville

Tier
2-C
Attack Potency
Low Multiverse Level
Speed
Immobile, up to Massively Hypersonic
Durability
Low Multiverse Level

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