Greninja should use Grass Knot instead of Extrasensory. ES doesn't offer any extra coverage, while Grass Knot lets it hit opposing Water types harder.
Galvantula has little use for a Shell Bell. Life Orb would be better, and you can compensate for the HP drain by switching Energy Ball with Giga Drain (if you can). And Galvantula gets Sticky Web, so swap Thunder Wave with that. You can slow down opposing Pokemon even when Galvantula's not there, as well as Electric and Ground types.
And I'm pretty sure Adaptability hasn't been released for Dragalge yet, so you can't use that as its ability (which unfortunately means you have to go with one of its rather redundant and sorta useless normal abilities).
Oh, and if this is for OU battles in Showdown, Kangaskhanite is banned to Ubers.
Extrasensory lets Greninja hit Tentacruel, which walls Greninja that lack the move. It also hits Keldeo harder than Grass Knot would.
Galvantula gained Sticky Web in Gen VI to slow down grounded switch-ins. Use it:
-Sticky Web
-Thunder
-Bug Buzz
-Volt Switch/Hidden Power (Ice/Fire)
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb/Focus Sash
Ability: Compound Eyes
Air Slash is somewhat weak on Noivern, who isn't that strong to begin with:
-Draco Meteor
-Flamethrower
-Focus Blast
-Switcheroo/Hurricane/U-turn/Roost
Nature: Timid/Naive
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Specs/Life Orb
Ability: Frisk/Infiltrator
Dragalge isn't that good without Adaptability. This appears to be an offensive team, so Toxic Spikes don't see much use. Klefki, on the other hand, provides another alternative entry hazard with Spikes; it also sets up Reflect/Light Screen to help your frail attackers:
-Reflect
-Light Screen
-Spikes
-Dazzling Gleam/Foul Play
Nature: Bold
EVs: 252 HP/152 Def/104 SDef
Item: Light Clay
Ability: Prankster
Other hazard setters to include are Forretress, Skarmory and Ferrothorn:
Forrretress:
-Spikes/Stealth Rock
-Rapid Spin
-Gyro Ball
-Earthquake/Volt Switch
Nature: Relaxed
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers
Skarmory:
-Spikes/Stealth Rock
-Whirlwind
-Roost
-Brave Bird/Defog
Nature: Impish/Careful
EVs: 252 HP/252 Def/4 SDef or 252 HP/4 Def/252 SDef
Item: Leftovers
Ability: Sturdy
Ferrothorn:
-Spikes/Stealth Rock
-Leech Seed
-Gyro Ball/Thunder Wave
-Power Whip/Protect
Nature: Relaxed
EVs: 252 HP/208 Def/48 SDef
Item: Leftovers
Ability: Iron Barbs
Aegislash's EV spread should be 240 HP/252 Atk/4 SDef/12 Spe to outspeed min Speed Tyranitar, while giving it a Leftovers number.