Spear Pillar (テンガンざん やりのはしら, Mt. Tengan Spear Pillar) is a location in the Pokémon series located in the Sinnoh region. Its debut was in Pokémon Diamond and Pearl Versions, where Dialga and/or Palkia could be captured.
Spear Pillar is a playable stage in Super Smash Bros. Brawl, and Dialga, Palkia, and Cresselia appear in the background to attack fighters and alter the stage. It is a destructible stage, which also features a cave underneath the surface which players can brawl in. Spear Pillar can be unlocked by completing Event 25: The Aura Is With Me.
After the first few seconds in battle, Dialga, Palkia, or Cresselia will show up in the background of the stage. Which Pokémon will appear is determined by the tint of the stage. If it is tinted blue, Dialga or Cresselia will appear. If it is tinted pink, Palkia will appear. The Pokémon will perform different attacks when they appear:
Dialga and Palkia
After a while, the legendary Pokémon will vanish in a puff of smoke, leaving the brawl to continue normally for a short time. Soon enough, it will return exactly the same as before. Only one Pokémon warps in per fight - they cannot switch in the middle of a match.
Uxie, Azelf, and Mesprit, other legendary Pokémon, also make appearances here. However, these Pokémon appear rarely on the stage, and if they do, they only sit and watch; they do not conduct any other experiments on the stage.
This stage is universally banned in mainstream tournaments due to the large and frequent number of overly powerful and disruptive hazards that Palkia, Dialga, and Cresselia can create that frequently disrupt gameplay or easily result in a turning tide for a lucky player (particularly when Palkia flips the stage sideways or turns it upside down). The bottom cavern of the stage also acts as a large cave of life to combatants, prolonging brawls and promoting stalling. The overall stage design with the separated top area and bottom area can allow for circle camping as well.
Spear Pillar debuts in Pokémon Diamond & Pearl, and can be found at the top of Mt. Coronet. In this game, the two legendary Pokémon Palkia and Dialga can be found at Spear Pillar. Team Galactic, the criminal organization of Sinnoh, travel up to Spear Pillar and awaken Dialga/Palkia, bound by a crystalline Red Chain from the Lake Guardians, in order to destroy the world and create a new universe where the Galactic Boss, Cyrus, is deity and king. Dawn or Lucas (not to be confused with the Lucas from Mother 3) travels up to Spear Pillar, where they impede Team Galactic's plan to control the legendary Pokémon by defeating their boss as his plan fails. Upon defeat, Team Galactic retreats and the player has the choice to defeat or capture Dialga/Palkia. High above the Spear Pillar is the Hall of Origin, where the omnipotent legendary Pokémon Arceus resides.