This article is incomplete. Please feel free to edit this article to add missing information and complete it. Reason: Missing manga section and complete layout maps for all seasons for both BW and B2W2.
Pinwheel Forest is a vast, forested stretch of land that extends over a large area in southeastern Unova. It is divided into two separate sectors. In Pokémon Black and White, the exterior is the only section of the forest available to explore before obtaining the Basic Badge, because a group of Team Plasma Grunts stand in the way just a few steps into the interior, preventing access to Pokémon living there.
From Nacrene City, a short paved road can be briefly taken to advance deeper into Pinwheel Forest, or one could detour into a narrow grassy path diverging from the main road, which instead proceeds further south. Nestled between some trees, a section of the railroad from Nacrene City can be seen, appearing to be discontinued due to its lack of completeness. Beyond more grass lies a marshy area speckled with grassy patches and shallow puddles. Flights of stairs to the far east guide the player up a rocky hill; the Challenge Rock rests in the center, where players can bring Fighting-type Pokémon to receive a Star PieceBW/StardustB2W2 daily. A Hidden Grotto is located on the upper right corner of this hill.
The heart of Pinwheel Forest takes on a more distinct forest atmosphere in contrast to its exterior section. The foliage is noticeably thicker, more abundant, and covers a substantial amount of area; the density of the leafage may be to blame for the constant lack of sunlight. The paved road originating from Nacrene City cuts a clean path through the forest, continuing westward briefly before taking a sharp turn to the north. The road passes over a tiny lake at its midpoint, and two elevated walkways accommodate pedestrians moving through the area. On both sides of the main road, maze-like trails snake their way through the landscape which enable players to explore deeper into the forest. Hollowed logs allow players to traverse through them to reach areas that are otherwise inaccessible. This area also contains a moss-covered rock located on its southern end, which allows Eevee to evolve into Leafeon if leveled up in the area.
In Pokémon Black and White, the east portion of the inner forest is initially blocked by an old man, and goes away after the player obtains the Insect Badge. At the deep end of this area holds the entrance to Rumination Field where the Legendary Pokémon Virizion resides; this area is only accessible after the player battles Cobalion.
Another Hidden Grotto can be found in the center of the forest to the left of the thin lake, and can only be reached by using Surf.
Pinwheel Forest is shown to be a huge forest in the anime. With mountains and fields on the outskirts, and a variety of foliage and moss. Inside the forest, there are mossy trees, one where a bunch of Galvantula live. In the middle of the forest is a giant tree where the whole forest can be seen from. It is also shown to have a waterfall and caves where Patrat live. A Pokémon Center is shown inside the forest.
The outskirts appeared in Scraggy-Hatched to be Wild! where Ash's Egg hatched into a Scraggy. He became a bully and picked on Ash's Pokémon. Later he was badly hurt by a Galvantula, but recovered after taking some medicine Iris had made. The next day he challenged the Galvantula again but needed saving from Ash and his friends after the entire colony of Galvantula joined in the fight. Then Scraggy had a battle with Axew which ended in a draw.
Just outside of Pinwheel Forest, a path leads to a huge Poké Mart where loads of goods are sold such as gems and jewelry. Pokémon Connoisseurs, including Burgundy, also set up booths in the area where they judge the compatibility that a Pokémon and their Trainer have. Ash, Iris and Cilan visited it in A Connoisseur's Revenge!.
Next, a small town is located with trees and rocky hills surrounding the place and a small stream. There is a small battleground where, in Dancing With the Ducklett Trio!, Axew battled Ash's Scraggy. In the town, there is also a Pokémon Center. A bunch of Ducklett lived there and stole people's possessions. Pikachu battled a Sandile they had met before here and Sandile evolved into a Krokorok. After that, the group finally reached the Skyarrow Bridge.
Its Japanese name comes from 矢車 yaguruma, "arrow wheel", a pair of ornamental wheels with a spherical spinning vane placed on top of a pole on which carp streamers are raised on. It is also a mon based on the yaguruma. The 矢 ya (arrow) in its Japanese name also relates to the アロー (arrow) in スカイアローブリッジ (Skyarrow Bridge). The name can also be taken from 矢車菊 yaguruma-kiku (cornflower) or 矢車草 yaguruma-sou (Rodgersia podophylla).
In other languages
ヤグルマの森 Yaguruma no mori
From pinwheel. The 'pin' in its name also relates to the 'arrow' in Skyarrow Bridge.