I don't know what Laqeeza is but if you mean rayquaza then you have to show professor oak both groudon and kyogre and he will give you a jade orb. you take it to the embedded tower and rayquaza will be there. you cannot just migrate groudon or kyogre you will need to trade for the one you cannot get.
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
No, but you can trade Pokemon only in HeartGold to Black
That is impossible in Pokemon HeartGold and SoulSilver.
Aura Beam is in Pokemon HeartGold.
No, there are no underwater routes in Pokemon HeartGold or SoulSilver. The HM Dive is not available in Pokemon HeartGold or SoulSilver.
Technically,yes you can get Arceus in Pokemon Heartgold,but only by trading it to your Pokemon Heartgold game from Pokemon diamond,pearl or platinum.
no, but use can use poketransfer from heartgold to white
Pokemon HeartGold can communicate with all the DS Pokemon games. :c)
there are many legendary Pokemon in Pokemon heartgold, but the best is HO-OH