Rate my team (SM)

Question

Alright, a noob that doesn't know anything about competitive battling other than tiers but still doesn't understand it speaking here.

Xurkitree @ Choice Scarf
Ability: Beast Boost
EVs: 252 Sp. Atk / 252 Spe / 4HP
Hasty Nature
- Thunderbolt
- Energy Ball
- Discharge
- Thunder

Thunderbolt and Discharge to deal some good damage And Energy ball to cover it's one and only weakness, Ground.

Garchomp (M) @ ???
Ability: Sand Veil
EVs: 252 Atk / 252 Spe / 4 HP
Jolly Nature
- Earthquake
- Stone Edge
- Dragon Claw
- Sandstorm

Simple enough. Earthquake spammer with Stone edge to cover it's Ice weakness. Dragon claw to deal with Dragon types too.

Mimikyu (F) @ Life Orb / Red Card / Focus Sash
Ability: Disguise
EVs: 252 Atk / 252 Spe / 4HP
Jolly Nature
- Swords Dance
- Play Rough
- Shadow Claw
- Shadow Sneak

Swords dance to boost Mimkyu's attack further until the disguise breaks. Play Rough and Shadow C,as for sweeping and Shadow Sneak if anyone dares to outspeed Mimikyu.

Greninja (Ash-Greninja) (M) @ ???
Ability: Battle Bond
EVs: 252 Spe / 128 Atk / 128 Sp Atk
Quiet Nature
- Ice beam
- Dark Pulse
- Scald
- Acrobatics

Ice Beam to deal with Grass, Dragon, Flying, Ground types. Dark Pulse and Scald for some good damage and Acrobatics to deal with Fighting types.

Heatran (F) @ ???
Ability: Flash Fire
EVs: 252 SP. Atk / 40 Spe / (I forgot how many EVs the Def stat has sorry)
Lax Nature
- Solar Beam
- Earth Power
- Lava Plume
- Flash Cannon

Solar beam for water and ground types. Earth Power and Lava Plume for good damage and Flash cannon to deal with Faries.

Missing a 6th Pokemon because I have no idea what tank I should get.
I'm gonna leave this here so someone could help me on which Pokemon I should have for a tank :p

-Miltank - Milk Drink / Curse / Heal Bell / Body Slam
-Pyukumuku - Soak / Taunt / Recover / Toxic
-Aegislash - Toxic / King's Shield / Shadow Sneak / Automize

Comments

A nature should decrease the stat a Pokemon needs the least. For example, Xurkitree doesn't use its physical attack at all, but it still uses its physical defense stat occasionally. Therefore, a timid nature would be better than a hasty nature.
If you can't decide what item to give to a Pokemon, give it leftovers.
Xurkitree should have ice hidden power to let it defeat grass and dragon Pokemon, as well as volt switch in case you don't feel like choice locking yourself. Thunderbolt, thunder, and discharge do almost the same thing, so replace two of those.
Let's pretend your Greninja was facing a fighting Pokemon. Scald would have 120 base power (80 power with STAB), and acrobatics would have 110 base power (55 base power with type chart). Therefore, acrobatics is useless for covering fighting. Give it something actually useful, like water shuriken or u-turn.
Your team should have a hazard remover, so you should probably add Skarmory.
Skarmory @ Rocky Helmet
Ability: Sturdy
EVs: 252 HP / 4 Def / 252 SpD
Careful nature
- Spikes
- Defog
- Roost
- Counter

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Rough Skin is almost always better than Sand Veil on Garchomp, even with Sandstorm.  Replace the ability as suggested, and replace Sandstorm with either Iron Tail or Poison Jab.  Competitive Garchomps usually hold either Life Orb or Choice Scarf, so that's a good place to start when deciding an item.

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Iron head is better than iron tail, and I think swords dance is better than both.

Answer 1

Without knowing what tier you want to play is hard to point out your weaknesses but your type coverage is pretty good, the few flaws i see are your moves a natures, i'll post some of your sets but corrected for more coverage and reliability and for the last mon i suggest some type of ground-resist or immune because you would struggle against other garchomps:

Xurkitree @ Choice Scarf
Ability: Beast Boost
EVs: 252 Sp. Atk / 252 Spe / 4HP
Timid Nature
- Thunderbolt
- Energy Ball
- Volt Switch (for taking momentum on an opponent's switch)
- Dazzling Gleam

Garchomp (M) @ Groundium Z
Ability: Rough Skin (much better than sand veil)
EVs: 252 Atk / 252 Spe / 4 HP
Jolly Nature
- Earthquake
- Stone Edge
- Dragon Claw
- Poison Jab

Mimikyu (F) @ Life Orb
Ability: Disguise
EVs: 252 Atk / 252 Spe / 4HP
Jolly Nature
- Swords Dance
- Play Rough
- Shadow Claw
- Shadow Sneak

nothing to say, good set

Greninja (Ash-Greninja) (M) @ Focus Sash (i prefer the protean one, more versatile)
Ability: Battle Bond
EVs: 252 Spe / 40 Atk / 216 Sp Atk
Hasty Nature
- Ice beam
- Dark Pulse
- Water Shuriken
- U-Turn

Heatran (F) @ Leftovers
Ability: Flash Fire
EVs: 252 SP. Atk / 40 Spe / 212 HP
Modest Nature
- Substitute
- Earth Power
- Lava Plume
- Flash Cannon

for the last one as i said i'll go with a flying-levitate or ground resist pokèmon because this team suffer a bit too much hard-hitting ground type pokèmon, hope i helped.

Comments

Thanks! I chose Skarmory for a flying type. Recommend a moveset?

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@Jonny The question was tagged "OU".
@Flan There's a Skarmory moveset in my comment on the original post. You can read that if you want.