Please rate my team in ORAS!

Question

Can you please rate my team for ORAS online play? If you have suggestions to improve my team, please comment it and tell me why. I appreciate any support for my team! (I just made an account today, sorry if I did anything wrong).

Mawile @ Mawilite
Ability: Intimidate - Huge Power (Mega Evolution)
EVs: 252 HP / 252 Atk / 4 Def
Adamant Nature
- Swords Dance
- Play Rough
- Iron Head
- Sucker Punch

Salamence @ ???
Ability: Moxie
EVs: 252 Atk / 252 Spe / 4 HP
Adamant Nature
- Dragon Dance
- Dragon Claw
- Zen Headbutt
- Stone Edge

Ninetales @ Heat Rock
Ability: Drought
EVs: 252 SpA / 252 Spe / 4 SpD
Modest Nature
- Nasty Plot
- Flamethrower
- Solar Beam
- Hypnosis

Lilligant @ Wide Lens
Ability: Chlorophyll
EVs: 252 Hp / 252 SpA / 4 Spe
Nature
- Quiver Dance
- Energy Ball
- Sleep Powder
- Dream Eater
(Lilligant's speed is doubled from Drought > Chlorophyll).

Gengar @ ???
Ability: Cursed Body
EVs: 252 SpA / 252 Spe / 4 Def
Modest Nature
- Shadow Ball
- Sludge Bomb
- Energy Ball
- Thunderbolt

~ If you have a suggestion for the final member of my team that works well with the other pokemon in my team, please post it with the Item, Ability, EVs, Nature and Move set. Thank you very much!

Comments

Replace Salamence, Ninetales, and Lilligant with Garchomp, Blaziken, and Tangrowth.

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If you would be so kind, could you give me the Item, ability, nature, evs and move set for those pokemon please? Maybe a short explanation on why they should be replaced and what they can do. I forgot to mention, but in ORAS single battles are 3 pokemon and doubles are 4.

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As for the last pokemon on my team, could you give me suggestions on what it could be and why? For Garchomp and Blaziken, I cannot have both of them holding a life orb for the duplicate item clause. Before you said to replace Lilligant with Tangrowth, so do you want me to use the Serperior or a Tangrowth? Is there anyway I can make Serperior's stats 252 ??? / 252 ??? because in ORAS I cannot see exact numbers for Evs.

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We give different advice for singles and doubles. If you want to use this team in both, then you should post 2 copies of this team in 2 separate threads. I know a lot more about singles than I do about doubles, so everything I tell you here is intended to work in singles.

Garchomp @ Life Orb
Ability: Rough Skin
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Dragon Claw
- Earthquake
- Fire Fang

Blaziken @ life orb
Ability: Speed Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Flare Blitz
- Superpower
- thunder punch
- Protect

Serperior @ Rocky Helmet
Ability: Contrary
EVs: 116 HP / 220 Def / 172 Spe
Timid Nature
- Reflect
- Synthesis
- Leaf Storm
- Glare

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Do you have a suggestion for what my last pokemon can be? Once you are done "improving" my team, please post the whole team in an answer with complete sets for every pokemon so I can understand better. Thank you very much sumwun for helping me on my first week here!