ORAS OU Small Local Tournament Help?

[jamiejamie8]

Charizard (M) @ Charizardite X
Ability: Blaze
Shiny: Yes
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Dragon Dance
- Flare Blitz
- Dragon Claw
- Roost

Jirachi @ Leftovers
Ability: Serene Grace
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Iron Head
- Body Slam
- Wish
- Protect

Gliscor @ Toxic Orb
Ability: Poison Heal
EVs: 252 HP / 184 Def / 72 Spe
Impish Nature
- Substitute
- Protect
- Earthquake
- Toxic

Cloyster @ Focus Sash
Ability: Skill Link
EVs: 252 Atk / 4 SpA / 252 Spe
Jolly Nature
- Shell Smash
- Icicle Spear
- Rock Blast
- Ice Shard

Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 248 HP / 252 Def / 8 Spe
Bold Nature
- Volt Switch
- Hydro Pump
- Will-O-Wisp
- Pain Split


This is my team so far, though none of it is fixed. I've made one or two teams before, but nothing too incredible. I was thinking of adding a stealth rocks user into the 6th slot, but it would probably be a lead. Was thinking possibly Landorus but I'm not sure what set up to use with him. Any constructive criticism is highly valued. Many thanks in advance!