You can only get registeel in ruby and sapphire and emerald.
Registeel is not catch able in Pokemon LeafGreen. In order to get a Registeel you will need to trade for one from Pokemon Ruby or Sapphire.
You cannot catch Registeel in Pokemon LeafGreen. This is due to FireRed and LeafGreen being able to trade with Ruby and Sapphire. Pokemon Ruby and Sapphire have the three legendary golem Pokemon including Registeel.
you cant
Only ruby, sapphire and emerald can catch registeel trade one from those games to leafgreen.
Trade it from ruby, sapphire or emerald.
leaf green is 1st gen and registeel is in 3rd gen sooo, in leaf green, it doesnt know what the regies are!
Regirock, Regice, and Registeel (and for that matter, Regigigas) are unobtainable in Fire Red and Leaf Green.
Registeel is a Steel type pokemon.
You can find regigigas in the snowpoint temple, but you'll need regirock,regice,registeel to battle it, it will be at lvl70
You can't find registeel in Pokemon HeartGold.
You can't find Registeel in Pokemon Platnium. You just migrate it in Pokemon Ruby, Pokemon Sapphire, and Pokemon Emerald.
Registeel is unobtainable from Pokemon Diamond and Pearl. You have to migrate it from Pokemon Ruby, Sapphire, or Emerald.