The game doesn't have a mechanic like that. However, there are ways to cross water in Pokemon Emerald:
* Surf: This HM allows you to surf on water and reach new areas.
* Fly: This HM lets you fly over water (and land) to reach different locations.
* Strength: This HM can be used to push boulders out of the way, sometimes revealing paths through water.
If you're stuck in a specific area and can't seem to get past the water, try these options:
* Check your HM list: Make sure you have the necessary HM to navigate the water.
* Explore the area: Look for alternative paths, such as bridges, hidden passages, or areas where you can use Strength to clear an obstacle.
* Talk to NPCs: Sometimes, other characters in the game can provide hints or information about how to get past an obstacle.
If you're still stuck, you can search online for walkthroughs or guides that can help you find specific solutions for the area you're stuck in.