Is this a good OU team?

Question

Whimsicott @ Big Root
Trait: Prankster
EVs: 252 Spd / 248 HP / 8 SDef
Timid Nature
- Leech Seed -stalling
- Stun Spore -set up
- Substitute-stalling
- Taunt -so they can't protect themselves
Big Root to boost Giga Drain and Leech Seed

Blissey (F) @ Leftovers
Trait: Natural Cure
EVs: 252 Def / 252 HP / 4 SDef
Bold Nature
- Calm Mind -raise defense
- Softboiled -restore health
- Seismic Toss -Blissey's attack and SpA aren't that good, so this is a good option
- Toxic

Jellicent (M) @ Leftovers
Trait: Water Absorb
EVs: 252 Def / 252 HP / 4 SAtk
Bold Nature
- Recover
- Scald (or maybe Surf) -STAB
- Shadow Ball -STAB
- Ice Beam

Ninjask @ Leftovers
Trait: Speed Boost
EVs: 252 Spd / 252 HP / 4 SDef
Timid Nature
- Baton Pass
- Protect
- Substitute
- Swords Dance
For support. Usually Baton Passes to Jirachi

Jirachi @ Occa Berry
Trait: Serene Grace
EVs: 224 SDef / 252 HP / 32 Spd
Gentle Nature
- Iron Head
- Thunder Wave
- Wish
- Doom Desire
Thunder Wave, Iron Head, and Serene Grace. nuff said

Hydreigon @ Leftovers
Trait: Levitate
EVs: 252 SAtk / 252 HP / 4 SDef
Modest Nature
- Dark Pulse -STAB
- Dragon Pulse -STAB
- Earthquake
- Roost (or maybe Dragon Dance?)

Comments

looks good to me. id change thunder wave with body slam cause it would be able to paralyze grounds types. plus theres a 60%  chance of paralyzing with serene grace and does damage

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Whimiscott, change Taunt to Giga Drain(maybe) and make the item leftovers.

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Hydreigon should have U-Turn instead of Earthquake, and Flamethrower over Roost. Blissey cannot be a Defensive Wall, only Specially Defensive, so either change the EVs to 252 SDef, 252 HP. calm mind raises SDef, not Def, but replace it with Aromatherapy.

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Protect / U-Turn > Doom Desire.

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1. Replace Big Root with Leftovers.
2. Uh, why does Blissey need calm mind when it's already got a huge special defence? Give it Heal Bell instead.
3. Replace Ice Beam with Will-O-Wisp
4. Your Ninjask is susceptible to Taunt. Replace Swords Dance with X-Scissor.
5. So while Serene Grace is fine and all, Heatran is still your worst enemy. Double resistance to Jirachi's STAB steel. You'd run out of Iron Heads before Heatran gets KO'd
6. Doom Desire is a terrible move. Give it something useful like Stealth Rock
7. Give Hydreigon Life Orb

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I love how people always say what i already said on RMT. xD