The following Umbreon builds are for supporting in coordinated teams
For supporting randoms include some of the following moves for survivability
- Mud Slap / Snarl / Light Screen / Reflect / Charm / Tickle
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If you want four Umbreons (recommended)
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Umbreon @ Wide Lens  
Ability: Synchronize  
Tera Type: (Any)  
EVs: 252 HP / 252 SpD / 4 Spe  
Calm Nature  
- Screech  
- Helping Hand  
- Taunt
- Skill Swap

Umbreon @ Wide Lens  
Ability: Synchronize  
Tera Type: (Any)  
EVs: 252 HP / 252 Def / 4 Spe  
Bold Nature  
- Screech  
- Helping Hand  
- Taunt
- Skill Swap

Umbreon @ Sitrus Berry 
Ability: Synchronize  
Tera Type: (Any)  
EVs: 252 HP / 252 SpD / 4 Spe  
Calm Nature   
- Fake Tears  
- Helping Hand  
- Taunt
- Skill Swap

Umbreon @ Sitrus Berry
Ability: Synchronize  
Tera Type: (Any)  
EVs: 252 HP / 252 Def / 4 Spe  
Bold Nature  
- Fake Tears  
- Helping Hand  
- Taunt
- Skill Swap

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If you want two Umbreons
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Umbreon @ Wide Lens  
Ability: Synchronize  
Tera Type: (Any)  
EVs: 252 HP / 252 SpD / 4 Spe  
Calm Nature  
- Screech  
- Fake Tears  
- Helping Hand  
- Taunt / Skill Swap

Umbreon @ Wide Lens  
Ability: Synchronize  
Tera Type: (Any)  
EVs: 252 HP / 252 Def / 4 Spe  
Bold Nature  
- Screech  
- Fake Tears  
- Helping Hand  
- Taunt / Skill Swap

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If you only want one Umbreon
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Umbreon @ Wide Lens  
Ability: Synchronize / Inner Focus
Tera Type: (Any)  
EVs: 40 HP / 252 Def / 216 SpD  
Bold Nature  
- Screech  
- Fake Tears  
- Helping Hand  
- Taunt / Skill Swap