Rate my team please! (OU team)

Question

Maria (Lopunny-Mega) (F) @ Lopunnite
Ability: Scrappy
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Ice Punch
- Fake Out
- High Jump Kick
- Toxic

Daniel (Dragonite) (M) @ Choice Scarf
Ability: Inner Focus
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Dragon Dance
- Outrage
- Earthquake
- Iron Head

K (Heatran) @ Air Balloon
Ability: Flash Fire
EVs: 4 HP / 252 Atk / 252 SpA
Quiet Nature
- Dragon Pulse
- Flamethrower
- Crunch
- Earthquake

O.T. Genesis (Tapu Koko) @ Life Orb
Ability: Electric Surge
EVs: 252 Atk / 4 Def / 252 SpA
Lax Nature
- Thunderbolt
- Calm Mind
- Brave Bird
- Iron Head

T-REKT (Tyranitar) @ Leftovers
Ability: Unnerve
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Dark Pulse
- Thunderbolt
- Fire Blast
- Earth Power

Judie (Kingdra) (F) @ Lansat Berry
Ability: Sniper
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Draco Meteor
- Hydro Pump
- Ice Beam
- Hidden Power [Fire]

Answer 1

The main problem with your team is that your sets are off-meta. There's a generally accepted 'standard' for most Pokemon and roles; straying out of it so often is risky and overall ineffective. For an offence team, this build is also lacking fast attackers, set-up sweepers and a concrete end-game plan. I will try to add some of these.

• Use Return over Toxic. This move rounds out Lopunny's neutral coverage. For offensive Pokemon, the best play is almost always to use a proactive move or switch out; Toxic doesn't help with that.

• Choice Scarf Dragonite is suboptimal, as its unimpressive base 80 Speed means it is unreliable at beating other Scarf users and +1 sweepers. The Flyinium Z set-up sweeper on Smogon is Dragonite's best set.

• You need to OHKO fairies for Iron Head to be worth it, or they will hit you back harder. Lele, Bulu, Magearna, Clefable etc. are all too bulky for that. The best play is to switch out.

• Don't use mixed sets unless you have a very good reason to do it. It forces you to sacrifice ideal EV investment and a good nature. Use a standard utility Heatran and a Choiced Tapu Koko.

• Do not use 'coverage' moves just because it looks good to use more types. Moves need to be fit for a specific purpose. Flying and Steel coverage is almost always weaker than boosted Thunderbolt. It's not worth it.

• Special Tyranitar isn't a good utilisation of its stats, nor the other special attackers you could use instead. A Choice Band Tyranitar is stronger and gives you a wallbreaker and Pursuit trapper.

• Kingdra is weak and slow if it doesn't have rain support. Ash-Greninja is a Water attacker that can stand on its own, and offers you a good source of priority. It can be your end-game plan off its raw stats alone.