Why does the weather station in Pokemon Gem Edition rain? Ask god for help

If it is the jade version, I went to the Weather Research Institute after customs clearance and found that the weather was abnormal. When you enter the institute and talk to the doctor on the second floor, he will tell you that the weather in XXX area is abnormal (it will be displayed in the conversation, and the numbers with special colors correspond to the road sections/waterways). As soon as you get to that place (it is best to fly to the city near that section, and there is a time limit for riding), you will find a cave (if it is a sunny section, it is a cave). If it is a stormy waterway, it is a small square diving area. After entering the cave/diving into the water, after a long journey, you will find Gulaton/Kyogre, where Lv70 is sleeping at the bottom of the cave. You can resist it or conquer it at the same time. When both of them are defeated or subdued, the abnormal weather will disappear. In addition, this kind of weather actually appears from time to time on this road. Not surprisingly, if it is ruby/sapphire version, the weather changes here are set purely to reflect the particularity of this changeable weather and have no practical significance. But if you fight wild monsters in the surrounding grass, the weather will be affected. On rainy days, the speed of monsters with light spirit will increase, and the speed of monsters with rain basin characteristics will automatically recover. Monsters with chlorophyll characteristics will speed up in sunny days. You can use this to train monsters with related characteristics.