You cannot change the gender of a Pokémon because it is set in stone, just like their abilities or natures, for example.
You can, however, breed the Pokémon in question with a Ditto, with Pokémon from the same egg-group(s) or with Pokémon of its evolutionary line (e.g., Charmander, Charmeleon and Charizard), as long they are of the opposite gender.
Please keep in mind that even though Baby Pokémon have a gender, they cannot breed whatsoever (e.g., Azurill, Pichu, Magby, etc).
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no
I don't belive you can.
no
i don't believe there is, only the option to change character's gender
Yes you can trade leafgreen version Pokemon to another leafgreen version.