OU:
The most notable Eviolite wall, obviously, is Chansey.
Chansey @ Eviolite
Ability: Natural Cure
EVs: 244 HP / 252 Def / 12 SpD
Bold Nature
- Seismic Toss
- Toxic
- Stealth Rock / Heal Bell
- Soft-Boiled
There aren't many others at this level, but here are some viable Eviolite users of lower tiers.
RU:
Porygon2 @ Eviolite
Ability: Trace
EVs: 252 HP / 104 Def / 152 SpD
Calm Nature
- Recover
- Thunder Wave
- Ice Beam
- Foul Play
Doublade @ Eviolite
Ability: No Guard
EVs: 252 HP / 180 Atk / 76 SpD
Adamant Nature
- Swords Dance
- Shadow Sneak
- Sacred Sword
- Shadow Claw
Gligar @ Eviolite
Ability: Immunity
EVs: 252 HP / 200 Def / 56 Spe
Impish Nature
- Roost
- Defog / Stealth Rock
- Earthquake
- Toxic / U-Turn / Knock Off
NU:
Piloswine @ Eviolite
Ability: Thick Fat
EVs: 252 HP / 252 Atk / 4 Def
Adamant Nature
- Stealth Rock
- Earthquake
- Ice Shard
- Icicle Crash
Golbat @ Eviolite
Ability: Infiltrator
EVs: 240 HP / 172 Def / 96 Spe
Impish Nature
- Roost
- Brave Bird
- Defog
- Taunt / Toxic
PU:
Ferroseed @ Eviolite
Ability: Iron Barbs
EVs: 248 HP / 128 Def / 132 SpD
Sassy Nature
- Spikes / Stealth Rock
- Leech Seed
- Gyro Ball
- Protect
Type: Null @ Eviolite
Ability: Battle Armor
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Swords Dance
- Return
- Rest
- Iron Defense