Pokemon Showdown OU's Help

I need a tiny bit of help on this team.

KingDino (Aerodactyl) @ Aerodactylite
Ability: Pressure
EVs: 252 Atk / 252 Spe
Naive Nature
- Ice Fang
- Stone Edge
- Earthquake
- Aerial Ace

KillingRobot (Magnezone) @ Choice Specs
Ability: Magnet Pull
EVs: 124 HP / 252 SpA / 132 Spe
Modest Nature
- Thunderbolt
- Volt Switch
- Hidden Power [Fire]
- Flash Cannon

Mole (Excadrill) @ Assault Vest
Ability: Mold Breaker
EVs: 64 HP / 252 Atk / 192 Spe
Adamant Nature
- Earthquake
- Rapid Spin
- Rock Slide
- Iron Head

HAES (Azumarill) @ Choice Band
Ability: Huge Power
EVs: 160 HP / 252 Atk / 4 Def / 92 Spe
Adamant Nature
- Aqua Jet
- Waterfall
- Play Rough
- Knock Off

SquishyBird (Talonflame) @ Life Orb
Ability: Gale Wings
EVs: 168 Atk / 252 SpA / 88 Spe
Naughty Nature
- Fire Blast
- Brave Bird
- Hidden Power [Ground]
- Roost

TankChomp (Garchomp) @ Rocky Helmet
Ability: Rough Skin
EVs: 44 HP / 40 Atk / 84 Def / 92 SpD / 8 Spe
- Earthquake
- Stealth Rock
- Swords Dance
- Outrage

Uh, it is usually bad for a team to only have one water resist, and that resist is a slow water type. I suggest you have your Magnezone choice scarf with 252 speed 252 sp atk, timid. This is to have speed control to check water types faster than your Azumarill.
Your Aeodactyl should be Adamant or Jolly
That Talonflame set is bad, I don't see a reason to use special moves on it so try the one below.
That Garchomp EV spread looks pretty random I don't know about that one either. I put a bulky and offensive spread below you can use.

Also, if you are asking for help with this team it would be nice to justify your choice of pokemon, spreads, etc. It makes it easier for someone else to help.
For example, I do not really understand that Excadrill spread. I do not think I am good enough to recommend pokemon changes though.

Edited Sets:

See this is why you should write or give some explanation about a set or mon if its something different from the standard set and why you have used it here, otherwise all people are gonna do is suggest the standard ones, because we as raters now have no clue what your teams intention is or what its doing.

Even though Assault Vest seems tempting on Excadrill, it's not worth it because Exadrill's Special Defense is terrible, even though it has high HP. A specially defensive spread is better for it:
-Earthquake
-Iron Head
-Rapid Spin
-Stealth Rock/Toxic
Nature: Careful
EVs: 252 HP/4 Def/252 SDef
Item: Leftovers
Ability: Mold Breaker

Mega Aerodactyl should have a Jolly nature, as Naive doesn't do anything for it.

Talonflame's Hidden Power Ground still does jack squat against Heatran:

0 SpA Talonflame Hidden Power Ground vs. 248 HP / 192+ SpD Heatran: 100-120 (25.9 - 31.1%) -- 3.5% chance to 4HKO after Leftovers recovery

While it does have a shot of 2HKOing offensive Heatran variants after Stealth Rock, Talonflame shouldn't be staying in on Heatran anyway, as it may go for a Stone Edge or cripple Talonflame with Toxic. Yes, Fire Blast hits Ferrothorn without triggering Iron Barbs, but Flare Blitz is still the better Fire STAB, since it works off of Talonflame's better Attack. Having both STABs come with recoil hurts, yes, but there's always the option to go with itemless Acrobatics; Roost also replenishes HP if Talonflame manages to get a free turn:
-Swords Dance
-Flare Blitz
-Brave Bird/Acrobatics
-Roost
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Sharp Beak/Sky Plate/none
Ability: Gale Wings

or
-Swords Dance
-Brave Bird/Acrobatics
-Taunt/Will-o-Wisp
-Roost
Nature: Adamant
EVs: 248 HP/252 Atk/8 Spe
Item: Leftovers/none
Ability: Gale Wings

or
-Brave Bird/Acrobatics
-Taunt/Will-o-Wisp
-Bulk Up/Will-o-Wisp
-Roost
Nature: Careful
EVs: 248 HP/252 SDef/8 Spe
Item: Leftovers/none
Ability: Gale Wings

or
-Flare Blitz
-Brave Bird
-U-turn
-Steel Wing/Tailwind
Nature: Adamant/Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Choice Band
Ability: Gale Wings

This team struggles against bulky Water Pokemon. Replacing Aerodactyl with Lati@s or even Mega Sceptile provides the team with another Water resistance:

Latias:
-Draco Meteor
-Psyshock/Hidden Power (Fire)
-Defog
-Healing Wish/Roost
Nature: Timid
EVs: 72 HP/184 SAtk/252 Spe
Item: Life Orb

Latios:
-Draco Meteor
-Psyshock
-Hidden Power (Fire)/Surf/Earthquake/Defog
-Roost/Defog
Nature: Timid/Hasty
EVs: 252 SAtk/4 SDef/252 Spe
IteM: Life Orb

or
-Calm Mind
-Draco Meteor
-Psyshock
-Roost
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Leftovers

or
-Draco Meteor
-Psyshock
-Hidden Power (Fire)/Defog
-Trick
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Choice Scarf

Mega Sceptile:
-Leaf Storm
-Dragon Pulse
-Focus Blast/Hidden Power (Fire)
-Earthquake/Protect
Nature: Naive/Timid
EVs: 4 Atk/252 SAtk/252 Spe
Item: Sceptilite
Ability: Overgrow

or
-Substitute
-Giga Drain
-Dragon Pulse
-Focus Blast
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Sceptilite
Ability: Overgrow

To be perfectly blunt here, your TankChomp set is an outright mess. What's the EV spread trying to accomplish here? What KOs does it even avoid? TankChomp should focus on bulk alone and abuse Rocky Helmet + Rough Skin:
-Stealth Rock
-Dragon Tail
-Earthquake/Fire Blast
-Toxic/Fire Blast
Nature: Impish
EVs: 240 HP/176 Def/92 Spe
Item: Rocky Helmet
Ability: Rough Skin

Swords Dance Garchomp should use max Attack/max Speed:
-Stealth Rock
-Outrage/Dragon Claw
-Earthquake
-Fire Blast/Swords Dance
Nature: Naive/Jolly
EVs: 252 Atk/4 SAtk/252 Spe
Item: Lum Berry/Focus Sash

or
-Swords Dance
-Dragon Claw/Outrage
-Earthquake
-Substitute/Stone Edge
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Salac Berry/Leftovers/Lum Berry