heartgold has 2 regions
Yes
yes
do you mean growlithe? you can't get them in soul silver, only available in heart gold, where, im not sure where to find them in heart gold.
at level 35
If you mean Pokemon Regions then the answer is no! There are only 4 games with 2 regions and that's Pokemon: Gold, Silver, Heart Gold and Soul Silver!
do you mean ds? if you do mean ds Pokemon heart gold is coming out in spring 2010, i am excited to get it, hope this answers your question!
You mean evlove. Quilava evolves into Typhlosion at Lv 36
if you mean "what Pokemon game is out in other places", than i guess heart gold and soul silver.
if you mean Pokemon gold then the answer is no and if you mean Pokemon haert gold then you can get him only with action replay
If you mean evolve around lv 16-18
Assuming you mean Heart Gold, it would be all of the same Pokemon as in the old gold silver and crystal games. with the exception of ho-oh as being the only legendary available. they are known as the Jhoto Pokemon
There is no route 23 in Pokemon gold but if you mean heart gold it is the north exit of indigo plateau south exit of route 22 and west exit of victory road.