With Pokemon ranger: shadows of almia beat the game. then on the ranger net use wifi to search for the manaphy egg mission. after completing it you can connect shadows of almia to pearl, diamond, platinum, heart gold or soul silver to send the manaphy egg over. it can be obtained after that by speaking to the guy in green at a pokemart.
You cannot breed Legendary Pokemon without cheats, except for Manaphy with Ditto.
migrate phione from Pokemon ranger
You can't get him without events or cheats. For Darkrai, Manaphy and Arceus you need a event to capture him.
There is no way, unless you got it in an event.
Manaphy can only be obtained through events or trading. To obtain a Manaphy, one must attend a Nintendo promotional event or trade with a trainer who already has obtained Manaphy.
look up cheats to get manaphy
Apart from using cheats,obtain manaphy and breed with a ditto.
u put ditto and manaphy in the day care center. u can't get them in diamond without cheats so u need to trade with soal silver or heart gold fot ditto and ranger for manaphy
The only way to get Manaphy without cheating or transferring is by trading for one.
to get Manaphy without cheating, you have to have Pokemon Ranger, beat a certain mission, and then somehow transfer the Manaphy egg to Diamond or Pearl.
I myself am not aware of this fact of finding Manaphy in Pokemon Silver, but my answer would be this cave you are looking for does not exist because Manaphy does not appear until Generation IV. If you are using cheats this answer is irrelivant.
you cant its impossible