You have to complete the Subspace Emissary.
To get Spear Pillar you need to beat solo event No. 25 ("The Aura is With Me").
Just do what the event tells you to do.
you can't
defeat event 37
51
you have to beat event match 25
beat event match 29
Only on super smash bros melee, if you complete event match 37, or do more than 200 multiplayer mode matches.
Jigglypuff - Clear Event Mode.
Complete Event 25 (The Aura Is With Me).
You have to complete the event mewtwo strikes
Beat all 40 events to unlock event 41