Five Island

Five Island, also known as Chrono Island, is where the Rocket Warehouse is located. However, before you start messing with Team Rocket, there's other better things to do. Surf west into the Water Labrynth, and you'll find an old man on land. Talk to him, and he'll give you an Egg that contains Togepi. Next, go east in the Water Labrynth to reach the Resort Gorgeous section. You'll reach another peice of land with some trainers and an empty house. Continue east and you'll reach the Lost Cave.