Actually, at Undella Bay, there is a place where you can go in the ocean, and in that place there is a dark spot in the water. Your pokemon has to know dive, but you can dive into that dark spot with dive. Once you do, you will see manaphy's castle, once you go in, you will have to fight it and capture it
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Manaphy was not available in Pokemon Emerald. Manaphy was not introduced until Generation 4 games Pokemon Diamond and Pearl. Manaphy is unique in that its offspring are Phione that cannot evolve into Manaphy.
Manaphy is a legendary water type of Pokemon. It is not possible to get this Pokemon in the game Pokemon LeafGreen.
The only way to get Manaphy is to get it from the first Pokemon Ranger. You can only get one per cartridge, so if you got one, you cannot play through the game again to get another one. It then have to be given as a mystery gift to Pokemon Diamond, Pearl, or Platinum. After you have the Manaphy on that game, you then have to do a Poke Transfer to transfer it over to Pokemon White 2. Your Only other options are trading it with someone or cheating.
There is no trainer in Pokemon Platinum with a Manaphy. However, you can trade with someone who has a Manaphy, or complete the special Ranger mission in Pokemon Ranger and transfer the Manaphy egg over to Pokemon Diamond, Pearl, or Platinum.