My team is horribly weak against water-types and fighting-types, but is otherwise doing OK. Should probably NOT be running Greninja and Azumarill on the same team, tho.

HOLY COW, I just won a fight by a single hit point.

I'm...definitely keeping a Focus Sash on Aegislash, then.

For those interested, here's my team:
Bronet (Smeargle) @ Focus Sash
Ability: Own Tempo
EVs: 252 HP / 4 SDef / 252 Spd
Timid Nature
- Spore
- Sticky Web
- Stealth Rock
- Spikes
Aegislash @ Focus Sash
Ability: Stance Change
- King's Shield
- Sacred Sword
- Shadow Sneak
- Swords Dance
Greninja (F) @ Life Orb
Ability: Protean
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature
- Dark Pulse
- Hydro Pump
- Ice Beam
- Hidden Power [Fire]
Kangaskhan (F) @ Kangaskhanite
Ability: Early Bird
EVs: 252 Spd / 252 Atk / 4 SDef
Jolly Nature
- Sucker Punch
- Earthquake
- Return
- Power-Up Punch
Azumarill @ Choice Band
Ability: Huge Power
EVs: 212 HP / 40 Spd / 252 Atk
Adamant Nature
- Play Rough
- Aqua Jet
- Superpower
- Return
Chesnaught (F) @ Leftovers
Ability: Bulletproof
- Spiky Shield
- Spikes
- Roar
- Wood Hammer