Once you have Kyrogre (in HeartGold version by getting the blue orb) and you have traded for a Groudon (in soul silver by getting the red orb), once you have both in your party, take them to Mr. Pokemon and he'll give you a Jade Orb. Take it to Embedded Tower and Rayquaza will appear.
You can't catch him in HeartGold. Only in SoulSilver. In HeartGold, you catch Kyogre in Embedded Tower. If you transfer either Kyogre or Groudon to the other game, you can catch Rayquayza
Get Rayquayza if you can (you'll need a Kyogre from HeartGold).
if you are talking about rayquayza in Pokemon you need to get it from your game boy emerald game
Rayquayza
Go to the Sky Pillar
no you have to migrate from emerald, sapphire, or ruby
On top of sky pillar.
You have to have both Kyogre and Groudon. You get the Red Orb from Mr. Pokemon to catch Groudon in the Embedded Tower. In addition, the Groudon has to be from SoulSilver and the Kyogre must be from HeartGold. Show them to Professor Oak for the Jade Orb to awaken Rayquayza.
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
They are not in Pokemon HeartGold
where is the pokemon transfer lab in heartgold