Diamond/Pearl Team Help Please

[Galivice]

Trying to make a Diamond/Pearl team. Always played Pokemon but never gonna try to be serious about it until now, and up until now didn't think it was this complicated... I'm pretty noob at pokemon and any help would be appreciated.

Garchomp @ Yache Berry
Sand Veil
Careful
- Stealth Rock
- Dragon Rush
- Earthquake
- Giga Impact? Don't know what should go here.

Alakazam @ ???
Synchronize
Quiet
- Psychic
- Reflect/Light Screen/Grass Knot/Recover?
- Reflect/Light Screen/Grass Knot/Recover?
- Reflect/Light Screen/Grass Knot/Recover? Which one do I leave out?

Ambipom @ ???
Pickup (not very helpful...)
Timid
- Baton Pass
- Nasty Plot
- Double Team?
- ???

Gengar @ ???
Levitate
- Hypnosis
- Dream Eater
- Curse (Ghost type)
- Destiny Bond

I don't know what else I need here. Thanks in advance for any help.