[Eeeh, I thought Terrakion was an Uber. Also, Wide Lens raises accuracy, which you don't really need.]
Scolipede is theoretically a good Spiker; it's fast and can set up early. It's extremely fragile though and has to watch out for Fake Out and super-effective priority moves. Roserade is a bit slower but can hold its own more effectively against special attacks; her paper-thin Defense is a downfall though. Froslass is faster than Roserade, slower than Scolipede, and has average defenses, but she can spinblock too.
If you're looking for a fast SRer, though... Skarmory can set up Spikes and Stealth Rock, then Whirlwind away to scout and on the way cripple the opposing team severely. It also has a reliable form of healing in Roost but should only have one entry hazard on its moveset to prevent an enemy from Taunting it into dead weight. Tyranitar has good all-around stats except for speed, which is key to entry hazard setup. The Sandstorm from its ability can also be annoying, especially with only one other Pokemon on your team that's immune to the damage (Flygon, which is probably going to be replaced anyway.) Unless you want to get an Unnerve Tyranitar, which is kind of an abilitywaste. Aerodactyl is probably the best Stealth Rocker: it's fast, doesn't need to watch out for Fake Out, and resists most priority moves. And, its attack is great. Ferrothorn can be considered as either a Spiker or a SRer. Iron Barbs can come in handy, and it has just two weaknesses, but must watch out for fast Fire-types (read: Rapidash.)
Crunch is good on Flygon, don't replace it. Why do you need Fire Punch? Earthquake is perfectly good against Steel-types. You might need Fire Punch for the occasional Steel-type that's immune to or resists Earthquake, but other than that it's unnecessary and should be replaced.
Also, Item Clause. I don't think Galvantula and Chandelure can both have Choice Specs.
