At level 38 it evolves into Klang, and at level 49 it evolves into Klinklang.
Klink evolves into Klang at level 38 on Pokemon Black.
Klink evolves into Klang at level 38 on Pokemon Black.
Level 38 then 49.
Catch a Klink in Chargestone Cave and level it up to level 38. It will then evolve into Klang.
Level 38
Klink evolves into Klang starting at level 38
Klink evolves into Klang at level 38, then evolves into Klinklang at level 49.
Kinklang is the final evolution in Klink and Klang, therefore it does not evolve.
You'll need to make it reach to level 38 and evolve it manually.
There are different ways of evolving Pokémon in Pokémon Black. Most evolve by leveling up, others evolve by using a type of stone on them. But not all Pokémon can evolve. Reshiram and Zekrom is a good example to that.
I assume you are talking about the gear Pokemon. Klink evolves into a Klang at level 38 and then into a Klinklang at level 49.
First, get a Klink and evolve it into a Klang (sorry, not sure which level!) Next train it to level 49 (Big Stadium and Small Court are good places for training.) Once you level it up to LV.49 or higher, it will evolve to Klingklang!!!