After you get Castform and defeating Team Aqua talk to the receptionist . Once a day she will give you a Weather Item. Keep talking to her everyday to receivea Heatrock
>After you have defeated Team Magma/Aqua, and have received the Castform gift, once a day when you enter the Weather Institute in Route 119 you can speak to the receptionist and she will give you one of four special items. These items are the special rocks that are used to prolong weather in battle.
[email protected] Rock
EV Spread Will go here . Eg. 252 HP/252SpA/4 Def
Nature will go there. Eg. Nature : Quirky
Trait/Ability will go there. Eg. Forecast
The rest is all correct :)