Because you must have a Groudon (soul silver) and a Kyogre (heart gold) and then professor oak will give you the jade orb
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ok first of all have both legendarys in your party, then go to him. -pokeman
After catching Kyogre, obtain a Groudon from a friend with Pokemon SoulSilver. You only need the Groudon temporarily. Talk to Professor Oak with both in your party, and Professor Oak will give you the Jade Orb to catch Raquayza.
You have to have Kyogre and Groudon in your party with you in Pokémon HeartGold and then you have to go see Professor Oak while you have them with you. If both Kyogre and Groudon have been caught in the Embedded Tower then Professor Oak will give you the Green Orb aka the Jade Orb.
there is no professor oak in ruby and sapphire
no. it must be caught at the embedded tower in Pokemon soulsilver and then traded into Pokemon heartgold.