HM strength to move boulders on Pokemon pearl?

You can't use HM Strength to move boulders in Pokémon Pearl. This ability was removed in Generation IV (Diamond, Pearl, and Platinum) and replaced with the "Move" ability, which is learned by the Pokémon "Bibarel".

Here's how to move boulders in Pokémon Pearl:

1. Catch a Bibarel: You can find Bibarel in the Eterna Forest.

2. Level up Bibarel to learn "Move": Bibarel learns Move at level 22.

3. Use Bibarel's "Move" ability: Stand next to a boulder and use Bibarel's Move ability.

Remember, you can only move boulders that have a yellow ! mark above them.