You can't change the time in Leaf Green nor Fire Red
I don't belive you can.
Pokemon LeafGreen does not have a time system. This makes it impossible to do evolutions that involve time such as evolving Eevee into Espeon or Umbreon.
The Name Rater in a house in Lavender Town can change your non-traded Pokemon's nickname.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
There is no nighttime.
Then you have to get all the Pokemon you can and try to get all the Pokemon.
You cannot naturally change your Pokémon gender in Pokémon LeafGreen, you will need to such a cheating device such as a GameShark or an Action Replay in order to accomplish this.
Time is not kept in leafgreen meaning there is no day or night.
no. it stays the same regardless of what you do
Not in Pokemon leafgreen only in Pokemon Firered never ever in Pokemon leafgreen And in Pokemon firered it is rare in power plant not available in Pokemon leafgreen?
Both games don't have an internal clock feature like gold and silver version so there is no way to change the time.
Yes, there is a time capsule on one island