help my uu sun team

victini
victory star
sunny day
v create
psycic
fusion bolt
nature
evs:252atk,252spatk,252spd
item:life orb

arcanine
intimidate
extreme speed
solarbeam
flare blitz
outrage
nature
evs:252atk,252spd,4spatk
item:choice band

tornadus
prankster
heat wave
hurricane
superpower
sludge wave
nature
evs:252spatk,252spd,4atk
item:choice specs

cofagreigus
mummy
protect
substitute
toxic
psycic
nature
evs:252def,252spdef,252hp
item:

rhyperior
solid rock
earthquake
megahorn
hammer arm
stone edge
nature
evs:252atk,252def,4hp


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i need help with,
natures
cofagreiguses item
and my 6th pokemon


please help and give cc

Xatu is a better weather set-upper, IMO, because of its Magic Bounce ability indirectly supporting the team. Victini is better off in an all-out attacking role:
-Sunny Day
-Roost
-U-turn
-Psychic/Night Shade
Nature: Calm/Careful
EVs: 252 HP/4 Def/252 SDef
Item: Heat Rock
Ability: Magic Bounce

IMO, Arcanine should make use of what it gained in B1/W1. SolarBeam runs off of its weaker Special Attack stat, while Outrage, despite having good coverage with Flare Blitz, leaves Arcanine locked in for 2-3 turns and confuses it after that:
-Flare Blitz
-Close Combat
-Wild Charge
-Morning Sun/ExtremeSpeed/Crunch
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb/Choice Band
Ability: Intimidate/Flash Fire

Tornadus is currently OU (both forms). A Rapid Spinner, like Hitmontop or Claydol are more useful to get rid of your team's Stealth Rock weakness:
Hitmontop:
-Rapid Spin
-Foresight/Toxic
-Close Combat
-Stone Edge/Sucker Punch
Nature: Impish
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers
Ability: Intimidate

Claydol:
-Stealth Rock
-Rapid Spin
-Earthquake
-Ice Beam/Toxic
Nature: Sassy/Careful
EVs: 252 HP/4 Def/252 SDef
Item: Leftovers

Chandelure may be of more use here than Cofagrigus because of its additional Fire typing:
-Substitute
-Fire Blast
-Shadow Ball
-Energy Ball/Will-o-Wisp
Nature: Modest
EVs: 68 HP/252 SAtk/4 SDef/184 Spe
Item: Leftovers

or
-Substitute
-Pain Split
-Fire Blast
-Shadow Ball
Nature: Modest
EVs: 68 HP/252 SAtk/4 SDef/184 Spe
Item: Life Orb

or
-Fire Blast/Overheat
-Shadow Ball
-Hidden Power (Fighting)
-Energy Ball/Trick
Nature: Modest
EVs: 68 HP/252 SAtk/4 SDef/184 Spe
Item: Choice Specs

or
-Fire Blast
-Shadow Ball
-Energy Ball
-Hidden Power (Fighting)/Trick
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Scarf

While Rhyperior seems tempting, don't bother using it because of its common weaknesses. Porygon2 might be a more bulky alternative because of its utility:
-Thunder Wave/Toxic
-Ice Beam
-Thunderbolt/Discharge
-Recover
Nature: Bold
EVs: 252 HP/176 Def/80 SDef
Item: Eviolite
Ability: Trace

Heat Rotom is another alternative because it has STAB Electric moves for dealing with Water Pokemon:
-Thunderbolt/Volt Switch
-Overheat
-Hidden Power (Grass)
-Trick
Nature: Modest/Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Specs/Choice Scarf

or
-Overheat
-Thunderbolt
-Will-o-Wisp
-Pain Split
Nature: Modest
EVs: 120 HP/252 SAtk/136 Spe
Item: Leftovers

Victini prefers to use only one form of offense at a time because splitting EVs in both offenses make it a bit weaker:
-V-Create
-Fusion Bolt
-U-turn
-Zen Headbutt/Brick Break
Nature: Adamant/Jolly
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Band

or
-V-Create
-Fusion Bolt
-U-turn
-Zen Headbutt/Flare Blitz
Nature: Adamant/Jolly
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Scarf

or
-V-Create/Fire Blast
-Psychic
-Grass Knot
-Focus Blast
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Specs

If you still want Victini to set up Sunny Day on its own, be my guest:
-Sunny Day
-V-Create
-U-turn
-Fusion Bolt
Nature: Adamant/Jolly
EVs: 252 SAtk/4 SDef/252 Spe
Item: Heat Rock