The "commonly" said stat required to clear up to Normal Lotus/Damien and Normal Slime "comfortably" is approximately 20k stat, but other factors such as account Legion Level, Link Skills, V Matrix progress, and Guild Noblesse Skills can affect this "metric".
See Bossing Tips for pointers relating to Evan's kit.
(Replace Superior Gollux pieces with Reinforced Gollux pieces if you do not want to spend time farming Gollux coins.)
Totems: 3x Afterlands Totems (Reddit guide on how to obtain) or 3x Guild Castle Totems
Ring Slot 1: Superior Gollux
Ring Slots 2, 3, 4 (Pick three): Reinforced Gollux | Solid Gollux | Kanna Treasure (Princess No) | Silver Blossom (Horntail) | x # of Event Ring(s)
Pocket: Pink Holy Cup (Pink Bean)
Pendant: Superior Gollux | Dominator Pendant (Normal Arkarium) | Mechanator Pendant (Arkarium)
Belt: Superior Gollux
Earring: Superior Gollux
Face: Condensed Power Crystal (Zakum) | Sweetwater Tattoo (Commerci)
Eye: Aquatic Letter Eye Accessory (Zakum) | Black Bean Mark (Pink Bean) | Papulatus Mark (Chaos Papulatus) | Sweetwater Monocle (Commerci)
Hat / Top / Bottom: Royal Dunwitch (Chaos Root Abyss)
Shoulder / Cape / Gloves / Shoes: Absolab (Scrapyard/Dark World weekly quests, and Damien/Lotus)
Weapon: Fafnir (Chaos Root Abyss) | Absolab | FakeAbso/FakeArcane (Event)
Secondary: Deimos Sage Shield
Emblem: Gold Heroes Emblem
Reverse Dragon Gear
Badge: Crystal Ventus (Magnus)
Heart: Lidium (usually comes with an event Android) | Fairy Heart (purchased from Event shops)
Familiars: Two/Three 15% Ignore Enemy Defense (common "gray" cards or rare "blue" cards)
If you are planning on making an Evan bossing mule, pre-6th job, it is likely already Level 210 for the class's link skill; therefore, you will have at least 15 node slots unlocked.
You will approximately need 500 Nodestones to max out Elemental Radiance and approximately 450 Nodestones to max each trinode. (Total: approximately 2300 Nodestones) [Page link to TriNodes]
The following skills should be slotted in:
TriNode Set A, #1
TriNode Set A, #2
TriNode Set B, #1
TriNode Set B, #2
Elemental Radiance (Must be Maxed and always placed into a Lv.5 Enhanced Node Slot)
Erda Nova (Lv.10 if possible, but not mandatory)
Dragon Slam
Elemental Barrage
Spiral of Mana
Maple Goddess Blessing
Decent Sharp Eyes (Lv.1 is enough)
Decent Speed Infusion (Lv.1 is enough)
Decent Combat Orders (Lv.1 is enough)
Mana Overload
Decent Advanced Blessing (Lv.1 is enough)
Replace with Ethereal Form for survival, if needed.