I'm looking for some help for my first competitive team. Right not I do not know which hold item to go with on my Aegislash, since Ferrothorn has my leftovers, as well as no idea who my last slot pokemon should be.

Ferrothorn @ Leftovers
252 HP / 48 Def / 208 SpD / 0 Spe
Relaxed
-Stealth Rocks
-Spikes
-Gyro Ball
-Power Whip

Mawile @ Mawilite
252 HP / 252 ATK / 4 SpD
Adamant
-Swords Dance
-Sucker Punch
-Iron Head
-Play Rough

Gengar @ Life Orb
252 SpA / 252 Spe / 4 HP
Timid
-Shadow Ball
-Sludge Bomb
-Thunderbolt
-Dark Pulse

Goodra @ Damp Rock
252 HP / 252 Def / 4 SpD
Bold
Hydration
-Infestation
-Toxic
-Rest
-Rain Dance

Aegislash @ ?
252 HP / 252 ATK / 4 SpD
Brave
-Sacred Sword
-Swords Dance
-Shadow Sneak
-King's Shield

Any tips or suggestions would be a lot of help.