Dunno but sources say Larvitar are pretty common in the Safari Zone but are rare (5% to exact, I know that) at Mt. Silver.
I don't think you can. However, Larvitar can be caught in either Mt. Silver of Johto Safari Zone in HeartGold. Not sure which one though.
In the Safari zone, they are pretty rare. They can be found, but they tend to flee after a few rounds. Once you find one, make sure you catch it.
the safari zone is located in johto after passing cianwood city and all of the caves.
No you can only get him in Johto at the safari zone.
use the binoculars to find out the area its in and run around in there for a minute
You cannot find Pikachu in the wild in Johto, however it may be possible to find one in the safari zone. In kanto they are found in Viridian Forrest.
you can only find it at night in the little forest { down south } in the johto region in soul silver.
There isn't one in johto. its in the kanto region where the safari zone use to be.
it isn't you have to get hoppip first
No
In the special johto area to the right.
You can find a Jigglypuff in the Johto Safari Zone in Pokémon HeartGold and SoulSilver in the Meadow and Swamp areas of the Safari Zone.