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Fastest answer: every new character gets one free from the Eve of the Evolution tutorial quest. For extras, the reliable spawn is the Empty Monolith's bottom floor at the Alpha Institute (165, -3708), and Securement Silo - ALPHA (80, -3599) in Chalk Peak drops it from the boss.

All spawn locations

LocationCoordinatesNotes
Tutorial - Eve of the Evolution-Guaranteed first Deviant for every new character. Easiest method by far.
Alpha Institute - Empty Monolith165, -3708Bottom floor of the Monolith - fixed spawn, check it whenever you're nearby.
GAIA Research Centre Ruins4080, -6375Broken Delta - head downstairs near the 1F elevators; the Emissary sits in the back glass room by the computers. Enemies around - come at ~level 18+.
Securement Silo - ALPHA80, -3599Chalk Peak - chance drop from the boss, not guaranteed. Expect multiple runs.
Red Sands-Top room near the rift anchor.
Rosetta strongholds-Very low spawn chance anywhere in Rosetta facilities.
Survive, Capture, Preserve scenario-Spawns across accessible wilderness areas; only attacks if attacked first.

Farming tips

TipDetail
Swap worldsUse the nearest Worldstone to hop servers and re-check spawn points - each world rolls its own spawns.
Check the area levelA deviant's starting level matches where it's found - the map shows each area's level, so farm the highest-level zone you can handle.
Silo runs for statsThe Silo Alpha boss drop is the repeatable farm - bring a squad and run it until the Emissary drops.
Set up its room firstBuild an Isolated Securement Unit with green lights and flowers before you capture - mood and power scale with its environment.
Sync before combatInteract with the deviant in its unit to synchronize it with your cradle - then you can summon and command it in fights.

FAQ

Where is the Butterfly Emissary in Once Human?

Guaranteed from the tutorial quest; otherwise the Empty Monolith at the Alpha Institute (165, -3708), GAIA Research Ruins in Broken Delta, or as a boss drop in Securement Silo Alpha.

Is Butterfly's Emissary good?

Yes - it's an Attacker-type combat deviant and one of the most-used early picks since everyone gets one free and it scales well into mid game.

What does Butterfly's Emissary like?

Green Light and Flowers - furnish its Securement Unit with both to maximize its mood and power.

Can I get more than one?

Yes - the tutorial only gives one, but wild spawns and the Silo Alpha boss drop are repeatable. Swap worlds at a Worldstone to re-roll spawn checks.