actually depends on what game you have and when the event comes up.
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The only way I know of is to capture one on a gba game migrate it to diamond or pearl and then trade it to platinum. Sorry if you don't have the gba games or diamond or pearl.
Yes and it works like this: Your going to have to migrate your Pokemon from your gba Pokemon game to the ds Pokemon each Pokemon should hold an item that you want to give to the ds Pokemon game when you migrate those Pokemon play the ds Pokemon game to capture them in the pal park then go check the PC for the Pokemon you caught each should still be holding the item you gave them from the gba Pokemon game now all you need to do is take the items and now your ds Pokemon game has the items!
It is impossible to catch a Deoxys in the wild in HeartGold & SoulSilver. You need to get one at a Nintendo Event or transfer one from a GBA game. Theres a Deoxys mission in the 3rd Ranger game. Capture it and it will be comfortable in any 4th gen game.
You must first get it from Emerald version and then trade it over. But if you have just Sapphire, you can't get it. you can"t get him but you can get him on gts You can't. You need to get it in another game pak. Fire Red for instance. Capture the Mew in Fire Red or Leaf Green and trade it to sapphire.
You can't. It's a GBA game and GBA game are'ne wi fi compatible!