When you talk to the weather guy on the second floor in the wetaher station he wont tell you where is kyogre what should you do in Pokemon emerald?

The weather man will mention that a certain area of Hoenn is experiencing heavy rainfall. Go to the place where he says has rain, you need to have dive with you. You must hurry though, as Kyogre's location will change if you take too long. Once you've arrived there you should find a cave entrance. Enter this cave and you will encounter Kyogre (level 70). Finding Groudon is similar - the weather man will tell you that a certain area of Hoenn is experiencing strong sunlight. Just like with Kyogre, hurry there and you should find a cave containing Groudon (level 70).