As an expert in Pokémon games, I can guide you through the process of obtaining a bike in Pokémon Sapphire. In the game, the Undercurrent, a special item that allows you to navigate underwater, is often associated with bike acquisition, but it's not directly related to getting a bike. Here's how you can get a bike:


1. Progress through the game until you reach the city of Cerulean City.
2. Once in Cerulean City, head to the Bike Shop, which is located near the Pokémon Center.
3. Inside the Bike Shop, you'll find a man who will give you a Bicycle. This is a special item that allows you to travel faster on land.

Here's the translation in Chinese:

作为精灵宝可梦游戏的专家，我可以指导你如何在《精灵宝可梦蓝宝石》中获得一辆自行车。在游戏中，潜流（Undercurrent）是一个特殊的物品，可以让你在水下导航，但它与获得自行车没有直接关系。以下是你如何获得自行车的步骤：


1. 在游戏中推进，直到你到达瑟蕾娜市（Cerulean City）。
2. 到达瑟蕾娜市后，前往自行车店，它位于宝可梦中心附近。
3. 在自行车店里，你会发现一个男人，他会赠送给你一辆自行车。这是一个特殊的物品，可以让你在陆地上更快地旅行。

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To get a bike in Pokemon Emerald (and Pokemon Ruby/Sapphire too!) you need to hustle your butt to Mauville City. It's the city that's near the center of the world map. To get there, head up from Slateport City and take the right path.read more >>