Pokemon sapphire how does gloom evolve into bellsome?

Gloom doesn't evolve into Bellossom in Pokémon Sapphire. There's a slight mix-up!

Here's how it works:

* Gloom evolves into Vileplume using a Sun Stone.

* Bellossom is an evolution of Oddish, but only in Pokémon Gold, Silver, Crystal, HeartGold, and SoulSilver. It requires using a Sun Stone on Oddish.

So, you won't find Bellossom in Pokémon Sapphire. But, you can still evolve your Gloom into the lovely Vileplume with a Sun Stone!