Nothing, you'll need someone that has HG so he/she can trade to you Kyogre and with both of them you can catch Rayquaza.
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you cant but you can trade it from Pokemon soul silver
No you can only get groudon in Pokemon ruby or emerald and transfer through Pal Park or if you have heart gold or silver soul you can catch and trade groudon to yourself
You have to trade it from soul silver to heart gold this is the only way
sorry you have to trade it to Pokemon soul silver
What you do is trade that Kyoger to a friend that has Pokemon soul silver for Groudon show that Groudon to Mr.pokémon and he will give you the Jade Orb with that orb you will be able to catch Raquaza. hope this helped