In whick Pokemon gym can you use strength in emerald?

You can use the move Strength in the Slateport City Gym in Pokemon Emerald.

Here's why:

* Slateport Gym Leader: The gym leader, Juan, uses Water-type Pokemon.

* Strength's Effectiveness: Strength is a Normal-type move, which is ineffective against Water-types.

* Puzzle Solution: You need to use Strength to move a boulder in the gym, allowing you to progress to Juan.

While Strength isn't the most effective move against Juan's team, it is crucial for solving the gym's puzzle and challenging the gym leader.