Rate my team! (not completed)

Alakazam is better off with Choice Specs/Choice Scarf as its item and Magic Guard as its ability. It's also better with Timid, since its Speed is one of its biggest selling points. And keep Shadow Ball.

Scrafty is better off with a Bulk up set. If it's running Hi Jump Kick, it should use Dragon Dance, since using HJK on a defensive set screams suicide:
-Dragon Dance
-Crunch
-Hi Jump Kick/Drain Punch
-Ice Punch/Drain Punch/Taunt
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Leftovers/Life Orb
Ability: Moxie

or
-Bulk Up
-Drain Punch
-Crunch/Dragon Tail
-Rest
Nature: Careful
EVs: 252 HP/8 Atk/248 SDef
Item: Leftovers
Ability: Shed Skin

(you'll have to breed for both of those sets)

While Swagger + Foul Play is an interesting combo on Krookodile, it's highly unreliable because there's a chance that your opponent can take you down with their boosted Attack if they're physically inclined. You're better off with a Bulk Up set:
-Bulk Up
-Earthquake
-Crunch
-Stone Edge/Taunt
Nature: Adamant
EVs: 156 HP/252 Atk/100 Spe
Item: Leftovers

Belly Drum is way too suicidal given Darmanitan's poor defenses. You're also not making the most out of its very good physical movepool because while Fire/Fighting has decent coverage, it's stopped by Dragonite, Salamence, Lati@s and Jellicent. You're better off with this for the best coverage that Darmanitan can possibly have:
-Flare Blitz
-U-turn
-Rock Slide
-Earthquake/Superpower
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb/Choice Band/Choice Scarf
Ability: Sheer Force

Milotic's stats lean towards the defensive side. This set shows Milotic's defensive potential; While Flame Orb does activate Marvel Scale, the self-induced burn whittles down at Milotic's health:
-Scald
-Recover
-Ice Beam
-Dragon Tail/Haze/Toxic
Nature: Bold
EVs: 252 HP/252 Def/4 SAtk
Item: Leftovers
Ability: Marvel Scale

As for your 6th slot, try out Mienshao as a Baton Passer. However, it can only learn the move by breeding:
-Substitute
-Baton Pass
-Hi Jump Kick
-Hidden Power (Ice)
Nature: Naive
EVs: 252 Atk/32 SAtk/224 Spe
Item: Life Orb
Ability: Regenerator

dualkitteh said:

[SIZE="a"]

Ok so Life Orb on Alakazam too? As for Krook, is Crunch the best dark type move it learns?[/SIZE]

Click to expand...

You could consider that, but since Alakazam is using Trick, use Choice Specs or Choice Scarf like I said. Only use Life Orb if you're using Calm Mind.

And yes, Crunch is Krookodile's most reliable Dark STAB.

Listing your EVs and roles would be helpfull for rating.

Since PlatinumDude has covered everyone but Alakazam, I shall give you the full set it requires:

Timid nature
Life Orb / Focus Sash
Magic Guard*
EVs: 4 Defense, 252 Sp. Atk, 252 Speed
- Calm Mind
- Psychic / Psyshock
- Shadow Ball
- Focus Blast

This is one of the recommended sets for Alakazam. Calm Mind buffs up your Sp. Attack and Sp. Defense. Psychic serves for your main STAB, although Psyshock can be considered if you need a Blissey counter. Shadow Ball and Focus Blast provide additional coverage against anything weak to Ghost and Fighting.

For the ability, Magic Guard is recommended but unfortunately the Dream World is undergoing maintenance and a revamp for Black 2 & White 2 so you'll just have to do with Inner Focus for now but come June 21st, check on the Dream World so that you can get one with Magic Guard.

Is this a competitive team? I notice you don't have any EVs listed.

Anyway, instead of changing Milotic's set change the moveset to Sleep Talk / Rest / Scald / Ice Beam. You also generally don't want a -Def nature since Milotic could use that Defense, so maybe try Calm (+SpDef -Atk)