What level does phantump evolve?

Phantump evolves into Trevenant when it is leveled up while holding a specific item called the "Aromatisse's Leaf," or simply at level 37 in the main Pokémon games. In some games, the evolution may be triggered by different conditions or items. Trevenant is a Ghost/Grass-type Pokémon, reflecting its origins as a ghostly tree spirit.