Sprout Tower (Japanese: マダツボミのとう Madatsubomi Tower) is a pagoda in Violet City in Johto. It is inhabited by monks who teach that all living beings coexist through cooperation. These monks train Bellsprout, and occasionally Hoothoot.
As trainers battle, the flexible pagoda shakes from side to side. This flexibility protects the tall tower from earthquakes. This technology is now known as 柔構造 jūkōzō, and applied to hundreds of modern high-rise buildings. Legend has it that a 100 foot Bellsprout was used to make the swaying pillar.
As night falls, ghosts are said to appear in the tower, in the form of Gastly.
The design of Sprout Tower is inspired by Buddhist temples in the Nara Prefecture of Japan, such as Kofukuji and Horyuji temples.

Route 42 is a northern Johto route that passes by the entrances to Mt. Mortar.Upon leaving from either the western or eastern terminus, a trainer must have a Pokémon with Surf to continue, as the route is divided twice over by small lakes. On the small landmass between the two, there is a tree that is able to be Cut, leading to a trio of Apricorn trees, much like those on Route 37.
Each of the landmasses on the route also features an entrance to a different part of Mt. Mortar, the only place in Johto to find the Pokémon Marill.