Gloom is listed as a Grass/Poison type in the current Pokémon Champions format, with usage data pulled from competitive teams, tournament results and Showdown-ready pastes tracked by MetaVGC. This page brings together its most common moveset, nature, ability, item, teammates and type weaknesses so you can judge where Gloom fits in a VGC team.
The most common build highlights Stench, Loaded Dice and Sassy 252/4/0/0/248/0. Its frequent moves include Strength Sap, Sleep Powder, Bullet Seed, Pollen Puff, Leech Seed, and Teeter Dance. Treat those choices as a data-backed starting point: they show what players are bringing, while EV spreads, Tera Type and the final move slot should still respond to your expected matchups.
Defensively, Gloom has important weaknesses to fire 2x, flying 2x, ice 2x, psychic 2x. That matters during teambuilding because a strong composition needs ways to cover those attacks without giving up offensive pressure. Partners such as Dewgong, Armarouge, Indeedee-F, Ting-Lu, and Lunala appear often because they can add positioning, type coverage, speed control or safer switches into common checks.
MetaVGC tracks recent teams using Gloom. Open the Gloom teams page to compare complete structures, copy Showdown pastes and see how players combine Gloom with other Pokémon in the active format.