You have to trade it while holding a metal coat.
you cannot evolve a porygon2 in leafgreen
You can evolve a Magmar in Diamond, Pearl and Platinum by trading it while it's holding a Magmarizer. However, Magmar cannot evolve in Pokemon firered and Leafgreen.
you trade it while holding an up-grade.
It evolves when you trade it while holding a Dragon Fang.
You can't evolve Yanma in Leafgreen. This is because Leafgreen was made before Yanmega was made. So basically in Leafgreen, Yanma is a Pokemon that can't evolve.
Poliwhirl evolves into Politoad when you trade it while it is holding a King's Rock.
You cannot catch a one, but if you trade a Graveler, it will evolve into a Golem.
You can't on leafgreen.
No, you cannot. You can evolve Misdreavus into Mismagius in Diamond/Pearl or later versions using a Dusk Stone.
Slowbro evolves into slowking when you trade it while it's holding a King's Rock.
Onix does not evolve at any lvl. You have to have it hold metal coat and then trade it. Then you will have steelix. Same goes for syther to evolve to sizzor.
no