Rate my Pokemon Black wifi team

Hi I just need you guys to rate my team, check over the moves and tell me if the items are ok. Also I need help deciding on a lead and determining how to split these six into a three man team. thanks:

Swampert
Item: leftovers
Moves:
1. stealth rock
2.surf
3.earthquakw
4. ice beam
My current lead mostly because of stealth rock my only real question is if he should remain the lead or not because of the susceptibility to Grass Knot

Machamp
Item: Lum Berry
Moves:
1. stone edge
2. bullet punch
3. dynamic punch
4. Payback
I like machamp a lot and he might have been my lead if I had a set up move. two main questions: 1. should I swap Lum Berry for something else? i was thinking choice band but no two pokemon can hold the same item. 2. I want to replace bullet punch because I AR'ed to get it on him and am afraid it might be considered an illegal move are there any good alternatives?

Gengar
Item: ?
Moves:
1. focus punch
2. subsitute
3. thunderbolt
4. Shadow ball
I'm having trouble deciding on an item for gengar, I have leftovers on there now but was thinking about choice specs, advice?
Sceptile
item: Choice Scarf
Moves:
1. energy ball
2. leaf storm'
3. Hidden power(ice)
4. Focus blast
no major concerns but I cant have two CS pokemon any helpful advice you got
Heatran
item: choice specs
Moves:
1. fire blast
2. earth power
3. hidden power(grass)
4. Explosion
Item and general advice
Dragonite:
item: Leftovers
Moves:
1. Dragon Dance
2. thunderbolt
3. Aerial Ace
4 Earthquake
Need help with item plus I would like a good dragon attack for STAB