You can use strength in Pokemon Diamond, however you do not use it much. It is located in the Lost Tower on Route 209. You must beat the sixth gym leader, Byron, in order to use it outside of battle. The areas in the game where you can use strength are Route 211 (West), Mt. Coronet, Oreburgh Gate (Basement), Stark Mountain, Snowpoint Temple, Wayward Cave (Basement), and Victory Road. Otherwise, you can use it in battle all you wont, although the move does not affect ghost Pokemon and isn't very effective against rock or steel type Pokemon.
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You need the cobble badge.
You need the 4th badge first to use it.
You use Strength to roll the movable boulders.
you can use the hm strength you can smash rocks with rock smash
You will be able to use HM04 Strength outside of battle after you defeat the 6th gym which is in Canalave City.