Rate my Shoddy battle team?

[Abrien Sliver]

Cloyster (M) @ Leftovers
Ability: Shell Armor
EVs: 252 HP/6 SAtk/252 SDef
Bold nature (+Def, -Atk)
- Toxic Spikes
- Rapid Spin
- Ice Beam
- Spike Cannon
---
Alakazam (M) @ Life Orb
Ability: Synchronize
EVs: 252 Spd/252 SAtk/4 SDef
Timid nature (+Spd, -Atk)
- Calm Mind
- Psychic
- Focus Blast
- Signal Beam
---
Gyarados (M) @ Leftovers
Ability: Intimidate
EVs: 252 Atk/4 Def/252 Spd
Jolly nature (+Spd, -SAtk)
- Dragon Dance
- Waterfall
- Ice Fang
- Stone Edge
---
Arcanine (M) @ Lum Berry
Ability: Intimidate
EVs: 192 HP/252 Atk/64 Spd
Adamant nature (+Atk, -SAtk)
- Fire Blast
- Extremespeed
- Toxic
- Overheat
---
Tyranitar (M) @ Leftovers
Ability: Sand Stream
EVs: 252 HP/52 Atk/28 Spd/176 SAtk
Brave nature (+Atk, -Spd)
- Substitute
- Focus Punch
- Dark Pulse
- Thunderbolt
---
Rhyperior (M) @ Leftovers
Ability: Solid Rock
EVs: 132 HP/192 Atk/168 Spd/16 SDef
Adamant nature (+Atk, -SAtk)
- Substitute
- Megahorn
- Stone Edge
- Earthquake
---  

[Abrien Sliver]

Cloyster is leading, mostly for set up of Toxic spikes and later to disperse Stealth rock or other spikes
Alakazam is my Special Sweeper 2CM and Special attack is @ 700+
Gyarados is secondary offensive, DD twice plus water fall STAB makes him a decent addition
Arcanine is set up as an anti-lead, Extreemspeed and intimidate make him pretty decent at crippling alot of leads, toxic bolsters that.
Tyranitar is on sight because he is a pretty decent SubPuncher. His ability to use thunderbolt makes him an unexpected counter to water types, Dark pulse is there for STAB bonus.
Rhyperior is designed as a Su(b)perior, He can make a 101 hp substitute and with his EVs Blissey and Cresselia can't break the substitute so easily.


These are my reasonings for them, if you can find a pokemon that can fill these spaces better or know o a strong grass type I can use to replace Rhyperior.  

[Kumi Katsuna]

Your ALAKAZAM is Adamant? That's kinda out of the ordinary.  

[Abrien Sliver]

That is weird, The Alakazam is supposed to be Timid...I've got to go fix that.

fix'd