The complete Pokemon RBY pokedex, part 4

Pokémon Name: Gloom
Type: Grass/Poison
Classification: Weed Pokemon
Pokédex Number: 044
Ability: Chlorophyll
Dream World ability: Stench
Useful Attacks: Giga Drain
Location Found:
Diamond/Pearl: Routes 224, 229 and 230
Platinum: Routes 224 and 230
HG/SS: Route 5 (night), Routes 47 and 48, Safari Zone (Marshland), Pokewalker - Treehouse
Black: Trade, Poke Transfer
White: Evolve Oddish

The game claims Gloom's drool is so offensive that it can "curl noses from more than a mile away." That is so nasty. Let's move on, shall we?

Evolution: From Oddish at 21, to Vileplume via Leaf Stone, to Bellossom via Sun Stone