Are you asking how to get a Scizor here? You have to catch a Scyther, which you can catch at the Bug Catching Contest held every Tuesday, Thursday, and Saturday, and trade it while it's holding a Metal Coat.
You need to pass the graduation exam and save sicor
you get sizor by trading a scyther that is holding a metal coat to another game
You cannot get Dialga in HeartGold version.
you can't get sinnoh in heartgold.
They are not in Pokemon HeartGold
Hoenn is not in heartgold version, only johto and kanto are in heartgold, hoenn is in emerald
HeartGold is the correct title.
You have to trade it to HeartGold from P/D/Pt
you can catch lugia in whil islands in heartgold
there is no Pokemon Mansion in Heartgold.
Only by trading a Squirtle to HeartGold.
In heartgold please :)