I don't think there is one. There isn't a Sky Pillar, but there is a Spear Pillar. It's on top of Mt. Coronet.
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At the very top of Sky Pillar.
sky pillar on the sky pillar on rt 114
Spear Pillar is at the top of Mt. Coronet (Sky Pillar, where you catch Rayquaza in Pokemon Ruby, Sapphire, and Emerald, does not appear in Platinum).
the spear pillar is only in Pokemon pearl and diamond . it isn't in Pokemon heartgold or soulsilver
the sky pillar is on route 131 or 132, whichever is the one to the east of pacifidlog. you will need a Pokemon with strength and rock smash