yes and no. If you wanna beat the elite four and finish u can make it in 24-30 hours of play. but if u wanna complete all the pokedex and national dex it takes much longer...100 hours or more.
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...? umm this question doesnt make sense. you do it by seeing Pokemon! all the Pokemon in the game! (no trade)
Yes you can trade leafgreen version Pokemon to another leafgreen version.
On Pokemon Pearl's title screen, if the Pokemon LeafGreen game is in the GBA slot, click on "Transfer From LeafGreen" and you can choose six Pokemon from LeafGreen to transfer to Pearl, but be careful-you can't trade them back.
Manaphy is a legendary water type of Pokemon. It is not possible to get this Pokemon in the game Pokemon LeafGreen.
Piplup does not exist in Pokemon LeafGreen or FireRed.