You can't. It's closed in generation 2 and 4
First of all, this route is in Kanto. If you did not beat the Elite Four yet, do it! Route 8 is the Route connecting Saffron City to Lavender Town.
You can catch a Meowth on: Route 5, Route 6, Route 7, Route 8, Route 38, Route 39
Route 8 Safari Zone (Nighttime)
You can't get to Route 214 in "Pokémon HeartGold" because there is no such thing as Route 214 in "HeartGold."
its on route 26
You can only catch Vulpix in SoulSilver, not in HeartGold. You can catch it on route 36 and route 37.
Yes, you can on route 32, route 42, and on route 43.
evil Pokemon
his house is on the route above cherrygrove
it is not on route 18
you can see it on route 1, route 2, and route 34567
growlithe is in route 36,37,48