Pokémon/Pokédex/Gloom

How to Evolve
If the Leaf Stone is used on it, Gloom becomes Vileplume. If the Sun Stone is used on it, it becomes Bellossom.

Since the Sun Stone exists only in Gold, Silver, and following, Gloom can only become Vileplume in Red, Blue, and Yellow.

TM/HM

 * RB/Y/GS/C/RS/FL: Cut, Double Team, Rest, Solarbeam, Toxic
 * GS/C/RS/FL: Attract, Flash, Frustration, Giga Drain, Hidden Power, Protect, Return, Sludge Bomb, Sunny Day
 * RB/Y: Bide, Double-Edge, Mega Drain, Mimic, Rage, Reflect, Substitute, Swords Dance, Take Down
 * GS/C: Curse, Endure, Sleep Talk, Snore, Swagger, Sweet Scent
 * RS/FL: Bullet Seed, Facade, Secret Power

Evolution

 * GS/C/RS/FL: Flail, Razor Leaf, Swords Dance, Synthesis
 * RS/FL: Charm, Ingrain

Trading Cards

 * Jungle #37 - Gloom
 * Team Rocket #36 - Dark Gloom
 * Team Rocket #37 - Dark Gloom
 * Gym Heroes #45 - Erika's Gloom
 * Gym Heroes #46 - Erika's Gloom
 * Neo Genesis #36 - Gloom
 * Expedition #78 - Gloom
 * Aquapolis #49 - Gloom
 * EX Hidden Legends #35 - Gloom