Suggestions wanted for my team, first go with building a legit pokemon team. (XY)

Question

So, I tossed this together to battle one of my friends that thinks that mostly legendaries is the only way to win a battle. It's based off of what I found looking around the internet and my own needs/wants, and I was wondering if it would be decent for competitive play, or just mucking about in link battles. If possible, could someone suggest a good pokemon to take out a Darkrai that'd be awesome.
My team is as follows:

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Maneater (Mawile) @ Mawilite
Ability: Hyper Cutter ---> Huge Power
EVs: 252 Atk / 252 HP / 4 Spd
Calm Nature
- Iron Head
- Swords Dance
- Sucker Punch
- Play Rough

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Shinobi (Greninja) @ Life Orb
Ability: Protean
EVs: 252 SAtk / 252 Spd / 4 HP
Timid Nature
- Scald
- Ice Beam
- Toxic Spikes
- U-Turn

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America (Togekiss) @ Leftovers
Ability: Serene Grace
EVs: 252 HP / 252 SAtk / 4 Def
Rash Nature
- Air Slash
- Wish
- Ancient Power
- Aura Sphere

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Purrankster (Meowstic) @ Light Clay
Ability: Prankster
EVs: 252 SAtk / 252 SDef / 4 HP
Timid Nature
- Psychic
- Light Screen
- Confide
- Thunder Wave

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Fiddy Scent (Breloom) @ Kings Rock
Ability: Technician
EVs: 252 Atk / 252 Spd / 4 HP
Adamant Nature
- Bullet Seed
- Mach Punch
- Rock Tomb
- Bulk Up

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Escargoo (Goodra) @ Assault Vest
Ability: Sap Sipper
EVs: 252 SAtk / 248 HP / 8 Spd
Quiet Nature
- Draco Meteor
- Fire Blast
- Thunder Bolt
- Dragon Tail

Comments

Do you know anything about Pokémon tiers? Just because Darkrai is in ubers and so is mega mawile but everything else in OU or lower. Do you want to make it an ubers team or an OU team? Or do you not care and just want strong Pokémon? XD

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nope, I don't know anything about the tiers, I've looked into it a bit, but decided nah I'm just gonna build a team with random pokemon that I think are OP. Is there somewhere that could explain the tiers in depth? It doesn't help that both megas I'd want are banned to ubers from OU.

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@SwaggyDuck i'm assuming that this is his friend he is battling, so it doesn't matter about tiers...

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In that case I have some improvements and a darkrai counter

Mawile is fine
Greninja is fine
Change ancient power to thunderwave on togekiss
Maybe try dual screens on meowstic
Give breloom a focus sash and change bulk up to spore
Goodra is fine

As for a Darkrai counter, try swapping mega Mawile for mega Blaziken
Blaziken@Blazikenite
Ability: Speed Boost
Adamant Nature
252 Att/252 Spe/4 hp
-Protect
-Swords Dance
-Flare Blitz
-Low Kick
You can outspeed Darkrai after a protect and low kick can 0HKO it. You can use high jump kick but it can miss and cost you and also low kick is great against legendries. Flare Blitz is STAB and SD boosts its attack. After Darkrai is dead, your speed will carry on growing and you can continue to sweep

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You know, I've been wanting a fire type, this is perfect, thanks so much!

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Your team is awesome! But what level are they? If you tell me the levels I can rate them properly!

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They are all level 100 because this is a competitive team. In competitive teams all Pokemon are assumed to be level 100 unless stated otherwise. If you're intending to rate it as an in-game team, don't bother, because in-game suggestions are completely different to competitive ones.
By the way, if you haven't already, consider reading the rules of the site? There have been a few issues with some of your recent posts that you'd know about if you'd read the rules. http://pokemondb.net/pokebase/rules