Finally got around to some spare time and I'm looking at forming my first XY team and I need some input / help on my selection here. I don't care too much about teirs as this will just be a general unranked / bros team.

First I'll post my initial team idea (still don't have a 6th) and then talk about what I'm thinking of replacing whom with as I've looked at this a bit more.

Mawile
Role: Physical Attacker
Nature: Adamant
Ability: Intimidate -> Huge Power
Item: Mawlite
EVs: 252 HP / 156 ATK / 92 SPD
- Rough Play
- Sucker Punch
- Iron Head
- Stone Edge

Gengar
Role: Special Attacker
Nature: Timid
Ability: Levitate
Item: ???
EVs: 4 HP / 252 SPA / 252 SPE
- Shadow Ball
- Sludge Bomb
- Focus Blast
- Destiny Bond

Trevenant
Role: Special Defense
Nature: Careful @ Chesto Berry
Ability: Harvest
Item: Chesto Berry
EVs: 252 HP / 80 DEF / 176 SDEF
- Rest
- Wood Hammer
- Leech Seed
- Will-O-Wisp

Arcanine
Role: Physical Defense
Nature: Impish
Ability: Flash Fire
Item: Leftovers
EVs: 248 HP / 244 DEF / 16 SPD
- Morning Sun
- Flare Blitz
- Extreme Speed
- Crunch

Meowstic (male)
Role: Support
Nature: Bold
Ability: Prankster
Item: Light Clay
EVs: 252 HP / 252 DEF / 4 SDEF
- Reflect
- Light Screen
- Sunny Day
- Psychic

With this I found that it seemed to physical orientated damage wise, and also seemed to turn too much into a Sunny Day team along with nothing in hazards. So here are the changes I was thinking of making.

- Replace Trevenant with Dragalge; apparently seems to be an okay Sp. Def Pokemon, + Toxic Spikes.
- Replace Arcanine with Cloyster; defense roll, + Rapid Spin and Spikes?
- Meowstic replace entirely, not sure on who, if at least replace the move Sunny Day with something else.
- Introduce Goodra for mixed attacker, have Assault Vest as the item. (Earthquake, Thunder / Thunderbolt / ??? / ???)
- I can see a lack of coverage for Fire / Fighting / Ground.