At lv. 30 and again at lv. 50 or 55, depends on how you raise it's level.
30 or 40
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In Pokemon Crystal you can find Dratini in Dragon's Den and Route 45. To find and catch Dratini you will need to use the Good Rod or Super Rod.
At level 45 or 55 depending on how you got your dratini at the first place...Kulwinder Singh!
To get a shiny Dratini in Pokemon Crystal you need to find one in the wild or hatch one. This is extremely rare though with a 1 in 8192 chance of the wild or hatched Dratini being a shiny. There is no way in Pokemon Crystal to improve these odds.
Dratini evolves into Dragonair, starting at level 30. Dragonair, then, evolves into Dragonite at level 55.
Level 36.
Level 30
Dratini evolves at level 30 into Dragonite.
at level 30
level 30
It evolves at level thirty.