Jolteon: I like it, but how about replacing HP Water for Light Screen because you can always Volt Switch in Feraligatr if things get bad. If you're faced with a Ground Type, Sigilyph is also a good alternative.
Feraligatr: Switch items with Lucario to go with Sheer Force, and maybe Brick Break instead of Superpower if it gets boosted, I don't know if it does.
Sigilyph: Replace Flash Cannon with Charge Beam for BoltBeam Combo. Not sure about Hypnosis' accuracy, if it misses you've wasted a turn. Might want Energy Ball for coverage instead. I'm liking it!
Togekiss: Maybe Tri Attack instead of Light Screen for Serene Grace.
Cradily: Perfect. Too bad you don't have room for Protect, but it's okay.
Lucario: Switch the items, and maybe get one of the anti - flinch abilities instead. He's 4X resistant to Dark, so he won't be hit unless you switch in on one targeted at Sigilyph.