This is a NetBattle team. Just clarifying that to prevent confusion(A few people have emailed me with concerns about what the teams were).

Gengar (M) @ Leftovers
Trait: Levitate
EVs: 6 Atk / 252 Spd / 252 SAtk
Timid Nature (+Spd, -Atk)
- Explosion
- Psychic
- Substitute
- Thunderbolt

I reccoment the McGar Set. Drop Psychic for Focus Punch and Explosion for Ice Punch. Try these EVs.. 48 HP / 136 Atk / 76 Spd / 248 SAtk.

Marowak (M) @ Thick Club
Trait: Rock Head
EVs: 252 Atk / 129 Def / 129 SDef
Adamant Nature (+Atk, -SAtk)
- Aerial Ace
- Earthquake
- Rock Slide
- Swords Dance

Good... Maybe adjust the EVs some, but other than that, it's good.

Ludicolo (F) @ Leftovers
Trait: Rain Dish
EVs: 252 HP / 129 Def / 129 SDef
Bold Nature (+Def, -Atk)
- Leech Seed
- Rain Dance
- Surf
- Toxic

Take the SDef EVs and add some to Def and the rest into SAtk. Drop Toxic for something.... Maybe HP:Grass or Giga Drain.

Miltank (F) @ Leftovers
Trait: Thick Fat
EVs: 252 HP / 129 Def / 129 SDef
Jolly Nature (+Spd, -SAtk)
- Heal Bell
- Milk Drink
- Seismic Toss
- Toxic

Adjust EVs as you go... Drop Toxic for Focus Punch(I think it learns it) or Shadow Ball.

Suicune @ Leftovers
Trait: Pressure
EVs: 252 HP / 252 Def / 6 SAtk
Bold Nature (+Def, -Atk)
- Calm Mind
- Ice Beam
- Rest
- Surf

Drop Something for Sub... Just adjust EVs as you go, making sure 'Cune has 404 HP.

Charizard@Salac Berry
252 Atk/252 HP/6 Spd
Female
-Belly Drum
-Overheat
-Earthquake
-HP Flying

You're fine as far as the moveset goes. 6 HP / 168 Atk / 54 Def / 252 Spd for the moveset. Also, if you're good with predicting, I've found that Leftovers works pretty well.