You cannot adjust the time or day in Pokémon Emerald once you have set it at the beginning of the game. The only way to change it is to start a new game, which will of course erase all of your saved data.
Basicaly the Pokemon change in there, but I don't know how to change the Pokemon.
Change the weather in battle to do that use moves like rain dance or sunny day.
No.
no!
you can't
it's random
Every 24 hours
yes there is
Yes, the TM Sunny Day is in Pokemon Emerald. You can find it in a cave in the middle of the lake in Route 120 called Scorched Slab.
Check the TV every day.
It is East of the contest hall.
You cant,But if you want to change gender restart the game