Spear Pillar is a place in Pokémon Diamond and Pearl and games where Dialga and Palkia can be found.
Spear Pillar

Super Smash Bros. series

Super Smash Bros. Brawl

Spear Pillar appears as a stage in Brawl, featuring Dialga, Palkia and Cresselia. It can be unlocked by beating the event match The Aura is With Me.