Where to find Dratini in Sun, Moon, Ultra Sun & Ultra Moon

SOS Encounter: Poni Gauntlet, Poni Meadow, Vast Poni Canyon (Only in Sun & Moon)
Super Rod: Poni Gauntlet (1%), Poni Meadow (1%), Vast Poni Canyon (1%, Only in Sun & Moon)
Surf: Poni Gauntlet (10%), Poni Meadow (10%), Vast Poni Canyon (10%, Only in Sun & Moon)

• Poni Gauntlet — SOS Encounter, Super Rod, Surf
• Poni Meadow — SOS Encounter, Super Rod, Surf
• Vast Poni Canyon — SOS Encounter, Super Rod, Surf

Dratini also appears in

• Dratini location in Legends: Z-A
• Dratini location in Scarlet & Violet
• Dratini location in Brilliant Diamond & Shining Pearl
• Dratini location in Sword & Shield
• Dratini location in Black & White / Black 2 & White 2
• Dratini location in HeartGold & SoulSilver
• Dratini location in Diamond, Pearl & Platinum
• Dratini location in FireRed & LeafGreen
• Dratini location in Gold, Silver & Crystal
• Dratini location in Red, Blue & Yellow

How to get Dratini in Sun, Moon, Ultra Sun & Ultra Moon

Its base catch rate is 45 out of 255 (higher is easier); the catch rate calculator works out your odds with each ball. For the look, the best colour match is Dive Ball.

Evolution: Dratini → Dragonair (Level 30) → Dragonite (Level 55).

Dratini in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)