Thanks for the help guys. and ive used some of your feedback and changed my team to this
Metagross @ Leftovers
Ability: Clear Body
EVs: 252 HP / 252 Def / 4 Spd
Jolly Nature
- Zen Headbutt
- Bullet Punch
- Ice Punch
- Stealth Rock
Garchomp @ Haban Berry
Ability: Rough Skin
EVs: 252 HP / 196 Def / 60 Spd
Jolly Nature
- Roar
- Earthquake
- Dragon Tail
- Stealth Rock
Gengar @ Life Orb
Ability: Levitate
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature
- Focus Blast
- Shadow Ball
- Destiny Bond
- Will-O-Wisp
Blissey (F) @ Leftovers
Ability: Natural Cure
EVs: 252 HP / 252 Def / 4 Spd
Bold Nature
- Seismic Toss
- Toxic
- Heal Bell
- Wish
Blastoise @ Leftovers
Ability: Torrent
EVs: 252 HP / 100 SDef / 56 SAtk / 100 Def
Calm Nature
- Rapid Spin
- Ice Beam
- Scald
- Hidden Power [Grass]
Infernape @ Expert Belt
Ability: Blaze
EVs: 180 Atk / 76 SAtk / 252 Spd
Hasty Nature
- Close Combat
- Mach Punch
- ThunderPunch
- Overheat
Stealth Rock is better off with a bulky spread for Metagross:
-Stealth Rock
-Meteor Mash
-Pursuit
-Earthquake/Hammer Arm
Nature: Adamant
EVs: 252 HP/96 Atk/160 SDef
Item: Leftovers
Support Garchomp should look like this. Having Roar and Dragon Tail is redundant, unless Garchomp is using RestTalk, and it's not ideal to do that:
-Stealth Rock
-Dragon Claw/Dragon Tail
-Earthquake
-Aqua Tail/Fire Blast/Protect
Nature: Jolly
EVs: 252 HP/196 Def/60 Spe
Item: Leftovers
If you want to use Destiny Bond on Gengar, use Taunt or Hidden Power Ice/Fire instead of Will-o-Wisp. Will-o-Wisp is best used with Substitute.
Support Blissey should look like this. Choose between Wish + Protect or a full-on cleric set:
-Wish/Softboiled
-Protect/Aromatherapy/Heal Bell
-Seismic Toss/Flamethrower
-Toxic
Nature: Calm
EVs: 4 HP/252 Def/252 SDef
Item: Leftovers
Ability: Natural Cure
In Gen V, Blastoise is outclassed as a Rapid Spinner. Make do with Starmie:
-Hydro Pump/Surf
-Thunderbolt/Psyshock
-Ice Beam
-Rapid Spin
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Leftovers
Ability: Natural Cure
or
-Scald
-Rapid Spin
-Psyshock/Ice Beam/Thunderbolt
-Recover
Nature: Timid
EVs: 248 HP/32 Def/4 SAtk/224 Spe
Item: Leftovers
Ability: Natural Cure
lol, I forgot Garchomp has a "support" set. Things is, you don't need Roar and Dragon Tail on the same set for Garchomp. Either change Dragon Tail to Dragon Claw, or change Roar to Fire Fang/Poison Jab.
Also, Metagross can't use Ice Punch until PokeBank is released. You'll have to put something else in that slot for the time being.
The OP specifically said that this team is for Gen V, so Ice Punch is safe.