To swim across water, you must go to the Safari Zone (In Fuchsia City (The pink one) towards the north). Go to the fourth area, and find the Secret House (You may have to do this a few times so you can get the route, and not waste any steps). There a man will give you HM03 (Surf). Teach this to a Pokemon (usually a water type). Then walk up to any body of water, go to that Pokemon, and click 'Surf'. This is very useful throughout the game.
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Yes you can trade leafgreen version Pokemon to another leafgreen version.
press a next to the water after teaching surf to your pokemon. hm surf is given to u by an old guy in the safari zone.
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.