Rate my Gen 8 OU team

Question

This was my first attempt at a competitive team and quite like it but it still need some improvements. Please tell me any flaws it may have and how I can improve it.

Alakazam @ Life Orb
Ability: Magic Guard
EV: 252 SpA / 4 SpD / 252 Spe
Modest Nature
- Focus Blast
- Psychic
- Nasty Plot
- Dazzling Gleam

Tapu Koko @ Life Orb
Ability: Electric Surge
EV: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Thunder Bolt
- Volt Switch
- Dazzling Gleam
- Calm Mind

Eldegoss @ Leftovers
Ability: Effect Spore
Calm Nature
- Leech Seed
- Protect
- Synthesis
- Sleep Powder

Umbreon @ Leftovers
Ability: Synchronize
Calm Nature
EV: 136 Hp / 252 Def / 120 SpD
- Moonlight
- Toxic
- Protect
- Heal Bell

Volcarona @ Heavy-Duty Boots
Ability: Flame Body
EV: 252 / 4 SpD / 252 Spe
Timid Nature
- Quiver Dance
- Fiery Dance
- Bug Buzz
- Giga Drain

Mew @ Focus Sash
Ability: Synchronize
EV: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Toxic Spikes
- Spikes
- U-turn
- Stealth Rock

Comments

man, that Mew 100% hates Defog and Rapid spin lol

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I feel like Umbreon is outclassed by Blissey who can run that same set and has more bulk.

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Umbreon and Eldegoss?

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Maybe they didn't choose Blissey because of its poor defense. Not saying it was a good choice, just giving the possible reason.

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Why use Mew instead of Deoxys-Speed to set up? Also Umbreon is outclassed by Blissey, and why have two stall mons?

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Isn't Deoxys banned from OU tho?

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It is, and Deoxys also got dexited.

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Yes I know about blissey and that is exactly why I didn't use it but I will think about it more, thank you.