You can't
Chat with our AI personalities
It is impossible without trading from Diamond, Pearl, or Platinum, or without the use of a glitch or cheating device.
No not every pokemon. You can't catch the starter Pokemon and many of the rare pokemon, you have to trade with Diamond. sorry ...
gai
That is the only way to get a manaphy without cheating. once you get the egg in Pokemon Ranger then trade it to diamond/pearl/platinum and when it hatches then you have got a manaphy.
one way is just migrate from one Pokemon leaf green or you'l get him\her at the end of the game without any cheating or hacking in Pokemon diamond or pearl but BEWARE it only works if you don't cheat or hack the first game because if you chated or hacked the first game and start a new game and finished the gme without cheating or hacking you won't get him\her! p.s that's not how you spell shaymin its shaymin