It evolves into Wormune starting at level 25, which evolves into Wormole starting at level 40.
Gworm eats nutrients found in dirt, which calms it. Wormole is often very calm, however when it is attacked by bird pokemon as prey, it becomes very aggressive, and it may spew juice which can cause the predator to flinch.
Gworm are beloved by farmers for their ability to plow the fields for them. However, they may get careless and dig into underground aquifers, ruining the farmlands.