you have to transfer it to the Pal Park after you get the National Pokedex.
There is no 'platnium', but you can find it on wild pokemon.
You can't find Registeel in Pokemon Platnium. You just migrate it in Pokemon Ruby, Pokemon Sapphire, and Pokemon Emerald.
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No only seviper
Trade it from pokemon ruby
you can't find it in Pokemon sapphire, but you can find it in Pokemon ruby. Hope this helped. :-)
you go to the top of the page and put your mouse on shop,center,more and at the bottom of the list it will say Pokemon locater click on it then go to Pokemon a-z then go to zangoose click on it then it will show a list of places you can find zangoose click one of them then look until you find a zangoose hope this helped
The way you can get zangoose in Pokemon heartgold is in the safari zone.
Honey Trees
in girantinas cave
in the trophey garden
Zangoose does not appear in Pokemon sapphire, but you CAN get it. To get it, you must trade Pokemon with your friend if your friend has Pokemon ruby which is the only game you can get zangoose in. Or you can just buy Pokemon ruby.