After u beat the elite 4, go back to the weather institute . Find the guy that gave u castform. He will tell u reports of drought and rainfall at different routes each time u go. Head down to that route immediately. Drought is GROUNDON,rainfall is kyogre. For rainfall,u will need dive.
The Weather Institute is not in Heart Gold. It is in Ruby, Sapphire, and Emerald.
There is not a weather institute in Pokemon Heartgold, you are thinking of Pokemon ruby, sapphire, and emerald, there is not a weather institute in Pokemon heartgold.
go west of fortree city and then there is going to be a bridge cross it and you will see the weather institute
he is in a cave but you have to get the guy at the weather institute to tell you where he is at
you have to catch or kill kyogre
He is to the west at the weather institute.
You get fly when you beat May/Brendan on route 119 after the Weather Institute.
Beat the elite four first.
The weatherman is in Route 119. He is inside the weather institute west of the bridge in Route 119.
Go to the weather institute on route 119 and go to the very top and you ll find him.
because in Pokemon emerald u get both groudon and kyogre so da wether keeps on changing
right of fortree