Is my team good? Feedback?

I came up with another team after doing some studying. What do you think?


Dragonite
Ability: Multiscale
Nature: Impish
Item: Leftovers
EV's: Def 255/ SpDef 255

Move set:
1. Thunder Wave
2. Dragon Claw
3. Wrap
4. Substitute

Garchomp
Ability: Rough Skin
Nature: Adamant
Item: Choice Band
EV's: Atk 255/ Spe 255

Move set:
1. Outrage
2. Earthquake
3. Fire Fang
4. Giga Impact

Alakazam
Ability: Magic Guard
Nature: Modest
Item: Life Orb
EV's: SpAtk 255/ Spe 255

Move set:
1. Psychic
2. Focus Blast
3. Hyper Beam
4. Shadow Ball

Blissey
Ability: Natural Cure
Nature: Calm
Item: Leftovers
EV's: Hp 255/ SpDef 253/ Spe 3

Move set:
1. Wish
2. Protect
3. Toxic
4. Baton Pass

Shuckle
Ability: Sturdy
Nature: Careful
Item: Chesto Berry
EV's: Hp 255/ Def 128/ SpDef 127

Move set:
1. Stealth Rock
2. Toxic
3. Attract
4. Rest

Forretress
Ability: Sturdy
Nature: Relaxed
Item: Leftovers
EV's: Hp 252/ Def 252/ SpDef 4

Move set:
1. Rapid Spin
2. Spikes
3. Volt Switch
4. Gyro Ball

Natures and EVs would totally be appreciated here.

Hydreigon is one of the best wallbreakers out there, so take advatnage of that fact. A 3 attacks set is better off with Substitute in the fourth slot in place of Roost to scout for switch-ins, with Draco Meteor replaced with Dragon Pulse. The nature and EV spread for thi set should be Modest with 4 HP/252 SAtk/252 Spe. A wallbreaking Hydreigon looks something like this:
-Draco Meteor
-Fire Blast
-Superpower
-Earthquake/Earth Power/Dark Pulse/Roost
Nature: Mild/Rash
EVs: 4 Atk/252 SAtk/252 Spe
Item: Life Orb/Expert Belt

Stealth Rock isn't a good option on Choice Tyranitar because it needs all its moveslots to cause damage to the opponent. If you really want Stealth Rock to be on it, then go for a support set:
-Stealth Rock
-Crunch
-Pursuit
-Fire Blast/Superpower/Stone Edge
Nature: Sassy/Careful
EVs: 252 HP/4 Atk/252 SDef
Item: Leftovers
Ability: Sand Stream

Choice Tyranitar should look like this:
-Stone Edge
-Crunch
-Pursuit
-Superpower
Nature: Adamant
EVs: 180 HP/252 Atk/76 Spe
Item: Choice Band
Ability: Sand Stream

Sandstorm ruins Dragonite's Multiscale (it only works if Dragonite is at full health), so Dragonite isn't seen on Sand teams at all. Replace it with Garchomp, whose typing is more suited for Sand teams:
-Outrage
-Earthquake
-Dragon Claw/Dual Chop
-Fire Fang/Aqua Tail/Stone Edge/Fire Blast
Nature: Jolly/Naive
EVs: 4 HP/252 Atk/252 Spe
Item: Choice Band/Choice Scarf

or
-Swords Dance
-Outrage/Dragon Claw
-Earthquake
-Fire Fang/Aqua Tail/Substitute
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Haban Berry/Yache Berry/Lum Berry/Salac Berry/Leftovers

Steelix isn't a good fit in OU because even though its Defense is massive, its low Special Defense is easily exploitable. Ferrothorn or Skarmory are more suited in OU:

Ferrothorn:
-Stealth Rock/Spikes
-Leech Seed/Stealth Rock
-Power Whip/Leech Seed/Protect
-Gyro Ball/Thunder Wave
Nature: Relaxed
EVs: 252 HP/48 Def/208 SDef
Item: Leftovers/Shed Shell

Skarmory:
-Stealth Rock/Spikes
-Whirlwind
-Roost
-Taunt/Brave Bird
Nature: Impish/Careful
EVs: 224 HP/252 Def/32 SDef or 224 HP/32 Def/252 SDef
Item: Leftovers/Shed Shell
Ability: Sturdy

Blissey's nature and EV spread should be Calm with 4 HP/252 Def/252 SDef.

Why would you have Charizard on a sand team? It's outclassed by a lot of things in OU and it's really weak to Stealth Rock. While Volcarona also has that weakness, its huge power compensates for it, and I'm not even suggesting it because you don't have a Rapid Spinner. Instead, you need another Fighting resist, like Reuniclus or Latias:

Reuniclus:
-Trick Room
-Psychic/Psyshock
-Shadow Ball
-Focus Blast/Hidden Power (Fire)
Nature: Quiet
EVs: 192 HP/64 Def/252 SAtk
Item: Life Orb
Ability: Magic Guard

or
-Calm Mind
-Psychic/Psyshock
-Focus Blast
-Recover
Nature: Bold
EVs: 252 HP/252 Def/4 SDef
Item: Life Orb/Leftovers
Ability: Magic Guard

Latias:
-Draco Meteor
-Psyshock
-Surf/Hidden Power (Fire)
-Recover
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb

or
-Calm Mind
-Dragon Pulse
-Recover
-Substitute/Hidden Power (Fire)/Psyshock
Nature: Timid
EVs: 252 HP/4 SAtk/252 Spe
Item: Leftovers

The way it looks at the moment your team it is going to struggle against Fighting-types, and four of your Pokemon are weak to that type, with the only exceptions being Hippowdon and Skarmory. Terrakion is particularly concerning because its added rock typing benefits from the Special Defense boost in a sandstorm.

Although this may seem like a strange option, Golurk should be slotted in because it's one of the best counters to Terrakion, and for some of the Fighting-types as well, because of its added Ghost typing. He should replace either Tyranitar or Hippowdon, as they both pack Sand Stream and Stealth Rock.

-Stealth Rock
-Ice Punch
-Shadow Punch
-Earthquake
Nature: Impish
EVs: 252 HP / 80 Atk / 176 Def
Item: Leftovers
Ability: Iron Fist

You could alternatively pick a Poison, Bug, Psychic or Flying type, as they resist Fighting as well, as long as it doesn't have the added Normal, Dark, Ice, Steel or Rock type. Ghost-types are immune and therefore the best choice. They also pack Will-O-Wisp to cripple Fighters.

Garchomp may seem like a good idea, but it is still slower than several common Fighting types such as Terrakion and Keldeo, which none of your team resists. That was why I recommended Golurk in place of Hippowdon. Speaking of Keldeo, you could also choose Toxicroak for your team, as it has Dry Skin whilst also resisting Fighting, making it the premier Keldeo counter.

Here are some defensive sets for Toxicroak.

-Bulk Up
-Ice Punch
-Drain Punch
-Substitute
Nature: Adamant
EVs: 244 HP / 132 Atk / 120 Def / 12 Spe
Item: Black Sludge
Ability: Dry Skin

-Protect / Substitute
-Toxic
-Drain Punch
-Ice Punch / Bulk Up
Nature: Impish
EVs: 244 HP / 252 Def / 12 Spe
Item: Black Sludge
Ability: Dry Skin