It is not possible to trade a Happiny to leaf green, not only because a Happiny does not exist in the Leaf Green pokedex but you can only transfer Pokemon from FireRed/LeafGreen/Emerald/Ruby/Sapphire to Diamond/Pearl/Platinum, and not the other way around.
You have to trade with emerald of ruby to get groudon in leafgreen.
Trade it
Trade A Haunter to Another Game
Trade with FireRed
trade it from sapphire.
Happiny is Generation IIII, and LeafGreen is Generation IIII.
Happiny is a 4th generation Pokemon none of those Pokemon existed in previous generation games like leafgreen.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
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Im sorry, but there is no happiny egg in Pokemon platinum. You got diamond or pearl? trade from there
Bellsprout has to be found wild, in leafgreen, you need to trade from Leafgreen for Pokemon.
no, you can't trade Pokemon from gold to leafgreen. But you can trade them from Pokemon XD from gamecube.
You have to trade with emerald of ruby to get groudon in leafgreen.
Sorry, but you can't. You can trade from LeafGreen to Pearl, but not back.
You can't. you have to trade from Pokemon diamond or pearl.
Trade with a friend or through global terminals trade using wi-fi connection
Shuckle is not available in Leafgreen. You will need to trade one from Emerald to Leafgreen.