Good luck, Goodbar. Be sure to ask questions if you have any. Errors like the one you made will hopefully be erased with experience.
As for Snovers, they're pretty tough I think. I don't remember what Mt. Coronet Top is like, so you may want to check that out. Route 217 is the only other place fit to chain them in. I'd give that a 7, as it's hard to see. The snow is falling, so sometimes you have to rely on the duration of time a patch moves to determine whether it's regular or flashing. Probably slightly easier than the Sandstorm. I had successful Snorunt chains there twice, however, so it's certainly doable. Give it a go.
Oh, I may have mixed up Routes 217 and 216, the southernmost one is the easiest.