Sorry, you can't.
(But I heard that you import it or something from Pokemon Ranger)
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No, you can't import it from Pokemon Ranger. You're thinking of Manaphy. ( Plus it's an egg)
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No, you' can somehow
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im pretty sure you can't catch it without cheats, its liek shaymin or acreus
It is impossible in the conditions you specified.
you do need cheats
There is the tweaking glitch...look it up.
You can't without cheats.
tradefrompearl
I can't memorize them exactly, but they're all on www.codejunkies.com under Nintendo ds/GBA/Pokemon diamond and pearl. There's cheats for 999 master balls, 999 rare candies, and cheats to walk everywhere. With the last cheat, you can get shaymin and darkrai without getting some mystery gift or whatever. liar liar, there is no cheat to gettin shaymin or darkrai without gettin mystery gift, i looked it up, and guess wat, no cheat.
transfer from emerald
its impossible without cheats
yes but you have to have oaks letter and that is an event item which you can no longer get
You can't get Shaymin in Heartgold and/or Soulsilver without cheats.
see 450 Pokemon in the pokedex