SM OU SM OU RTM, Is it decent enough?

[Hosthan]

Introduction​

Hey, i'm pretty new to own pokemon team building, (till now i've been looking for teams online), so this is my first try for something decent, it's an offensive team overall and my aim is to win the game as fast as possible.

Tornadus-Therian @ Flyinium Z
Ability: Regenerator
EVs: 100 HP / 116 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Hurricane
- Heat Wave
- Taunt
- Defog
​

So, i first wanted to have a Tornadus Therian in my team, no real reason why, but anyway it is a very good pokemon. I use Hurricane and flynium Z which is devastating most of the time, heat wave for coverage, Taunt for dealing with stallers or set ups and defog for hazard controll, evs' goals are for it to 1hko Mega Scizor with HW at 100% while still maintaning a little bit of tankiness.

Tapu Koko @ Shuca Berry
Ability: Electric Surge
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
- Volt Switch
- Wild Charge
- Hidden Power [Ice]
- Brave Bird
​

Now i wanted a revenge killer, i choosed koko cause of it's good coverage and speed. The set is weird at first, but i find it to work somewhat ok, wild charge is going to hit hard, volt switch for clean revenge killing, HP Ice cause of garchomp and landorus (always 2HKO) and brave bird for coverage. Shuca Berry is there to not get obliterated with just 1 EQ. I'm not really liking this set too much, it does it work but it just doesn't do anything else. I've already tried Jolteon, but it was even worse.

Latios-Mega @ Latiosite
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Dragon Pulse
- Psyshock
- Ice Beam
​

At this point i still needed someone who can actually OHKO. If it gets to set up it is done most of the time. Calm Mind for setting up, DP and Psyshock for STAB and Ice Beam for coverage, this is my most reliable way to kill 4x ICE types. I've come across the problem it gets countered by a lot of stuff, tanky steel types and Weavile being the main ones.

Tyranitar @ Leftovers
Ability: Sand Stream
EVs: 252 HP / 104 Atk / 96 Def / 56 SpD
Adamant Nature
- Stealth Rock
- Pursuit
- Stone Edge
- Earthquake
​

With this mon i wanted to have a reliable lead and good coverage aswell, Tyranitar does the work pretty fine, Stealth Rock for hazards, pursuit can change entire games, Stone Edge for stab and EQ for coverage. EVS are there for it to be a wall from both sides. Till now it is been working pretty fine. Almost forgot, leftovers for little sustain.

Jirachi @ Choice Scarf
Ability: Serene Grace
EVs: 60 HP / 252 Atk / 196 Spe
Adamant Nature
- Iron Head
- Zen Headbutt
- U-turn
- Drain Punch
​

At first i chose a banded kartana, but then come across the problem my team gets OBLITERATED by Scarf Lele, so i swapped to this little boy. Scarf for outspeeding most of the meta and Flinch the hell out of them. Iron Head and Zen Headbutt because STAB and Serene Grace, U-turn in case of a bad matchup and Drain Punch for coverage. EVS are exactly there for outspeeding Mamoswine or Heatran scarf. It gets its job done, and sometimes Serene Grace wins unwinnable games.

Volcanion @ Leftovers
Ability: Water Absorb
EVs: 252 HP / 4 SpA / 252 SpD
Bold Nature
IVs: 0 Atk
- Steam Eruption
- Heat Wave
- Haze
- Toxic
​

So at this point i needed: A special wall, i chose volcanion because steam eruption 2HKOs the meta, oh and too because its nice defense stat. It is a good Wall with a lot of resistances, but being weak to EQ and volt switch is a big downfall. I chose Steam Eruption and Heat wave for coverage, Haze for countering set ups and toxic for utility.

Conclusion​

After all, this team is doing slightly ok, at first i lost 200 elo using it, but with changes im starting to recover them with the same team.
What would you change? Thanks for reading ^^

Importable

Tornadus-Therian @ Flyinium Z
Ability: Regenerator
EVs: 100 HP / 116 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Hurricane
- Heat Wave
- Taunt
- Defog

Tapu Koko @ Shuca Berry
Ability: Electric Surge
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
- Volt Switch
- Wild Charge
- Hidden Power [Ice]
- Brave Bird

Latios-Mega @ Latiosite
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Dragon Pulse
- Psyshock
- Ice Beam

Tyranitar @ Leftovers
Ability: Sand Stream
EVs: 252 HP / 104 Atk / 96 Def / 56 SpD
Adamant Nature
- Stealth Rock
- Pursuit
- Stone Edge
- Earthquake

Jirachi @ Choice Scarf
Ability: Serene Grace
EVs: 60 HP / 252 Atk / 196 Spe
Adamant Nature
- Iron Head
- Zen Headbutt
- U-turn
- Drain Punch

Volcanion @ Leftovers
Ability: Water Absorb
EVs: 252 HP / 4 SpA / 252 SpD
Bold Nature
IVs: 0 Atk
- Steam Eruption
- Heat Wave
- Haze
- Toxic