Dragonair evolves into Dragonite at level 55 in the main Pokémon series games, such as the original Red/Blue, FireRed/LeafGreen, and most modern remakes.

When Dragonair evolves

  • Dragonair is the middle stage of the Dratini → Dragonair → Dragonite line.
  • It first evolves from Dratini at level 30 , then becomes Dragonite once it reaches level 55 simply by leveling up in battle or with experience items.

Evolution in different games

In most core titles (e.g., FireRed/LeafGreen, HeartGold/SoulSilver, Let’s Go, home‑style remakes), Dragonair still follows the same level‑based evolution and does not require items or special conditions.

A few fan or spin‑off games may add extra requirements (like friendship or held items), but in the official canon , level 55 is the standard trigger.

So short answer to “what level does Dragonair evolve?” is:
Dragonair evolves into Dragonite at level 55.