I wasn’t planning to type out this much, but I did. These are just suggested movesets, you should be fine with whatever you chose to use. I didn’t include Armor Tyranitar, but you could easily switch out one Poke for him. I am pretty poor in looking for overall weaknesses and synergies, so your mileage may vary. I did, however, notice that this team is pretty Hyper-Offensive, which is fine if that’s how you like to play. I also did not include EVs, but standard spreads (252 in two stats, 4 in one) should be fine.
You don’t have many options for D. Char. for ability, so you will probably want something like
D.Charizard w/ D. Charizardite
A: Spirit Call (Noctem)
The last slot will either be setup or priority.
Little ability choice again with D. Gallade and remember to save before you battle the D. Ralts so that you can quickly restart if it is female.
D. Gallade w/ Expert Belt
A: Volt Absorb
I gave D. Gallade an Expert Belt due to the fantastic coverage Ice+Electric has on its own and D. Gallade’s other coverage. You could also use a Life Orb since you have Drain Punch. The elemental Punches can be used over Crash/Charge if you don’t want to worry so much about Accuracy/Recoil. Night Slash nets only 220 pokemon not super effectively hit, however Zen Headbutt can be used instead for 235 pokemon, but it better covers your team’s fighting weakness (Which would be worse with Tyranitar, but it could work). Drain Punch is more coverage plus good recovery.
If you use Nidoking, you use Sheer Force + Life Orb. No Exceptions. As for a moveset, just get Poison Jab as a Nidorino, Earth Power as a Nidoking, and whatever other coverage TMs you would like, such as Thunderbolt, Focus Blast, Megahorn (Learnset) if you need that coverage badly, etc.
Crawdaunt, if you aren’t using the Megastone, make sure he has Adaptability.
Crawdaunt w/ Life Orb
Taken straight from Smogon, TBH. Aqua Jet is a must for priority, Knock Off kills anything with an item except Megas, Crabhammer for anything that Knock Off doesn’t Knock Out, and Swords Dance to make sure that you destroy everything.
Arcanine can run either Flash Fire or Intimidate, your choice.
Arcanine w/ Leftovers
A: Flash Fire/Intimidate
Leftovers for passive recovery, Morning Sun is almost a must for immediate recovery. Flare Blitz for powerful STAB. The next two slots will be coverage and priority. Thunder Fang and Flamethrower are there in case you want to avoid the recoil damage.
Alakazam usually runs Magic Guard.
Alakazam w/ Life Orb
A: Magic Guard
Life Orb just increases power with Magic Guard. Psychic for STAB, Focus Blast for coverage for Dark Types not named Sableye/Spiritomb. The next two are for coverage, although Recover is an option if you’d like to try it.