From Bulbapedia, the community-driven Pokémon encyclopedia.
Lyra Forest (Japanese: ライラのもり Lyra Forest) is a forest in western Fiore. It is the location of a few missions in Pokémon Ranger, including the first two. It is a lush forest that contains many wild Pokémon. Ringtown is located to the south of the forest, while the Krokka Tunnel to the North-East connects the area to Fall City.
A notable landmark is the Middle Tree, which stands exactly halfway between Ringtown and Fall City. A shrine to Celebi can be found near the depths of the forest. Labyrinth Grove contains areas that are exactly the same other than the Pokémon within them.
There are a number of mischievous Pokémon in the forest. Weepinbell and Victreebel will attempt to swallow Rangers and send them flying back to the entrance of the area they are in. Beedrill will hide behind trees and then chase Rangers relentlessly.
Three missions in the main story take place in the Lyra Forest. The Rookie Mission does not go very far from the Ringtown entrance. A resident's Taillow must be captured, followed by a Mudkip to put out a fire. In the first numbered mission, Professor Hastings must be escorted to Fall City, beginning with a path through the forest that leads to the entrance of Krokka Tunnel. It is not until mission 6 that the depths of the forest to the west can be explored. Lunick and Solana investigate an old man being lost there, though the non-player character stays behind with a girl who has lost her Jigglypuff.
Two Ranger Net missions also take place in the forest. In the second mission, remnants of the Go-Rock Squad awaken Celebi, who must then be captured. In the fourth mission, a net mission, a Manaphy Egg must be retrieved in the area around the entrance to Krokka Tunnel. After the mission has been completed, the Manaphy Egg can be transferred from this game to Pokémon Diamond or Pokémon Pearl. The player will then need to speak to a man in a Poké Mart to obtain it.
This is a listing of the Pokémon found in Lyra Forest after the credits: