well.... you should really evolve it at level 49 because it will learn hydro pump and it has lots of advantages and it will really help for strong battles like the elite four perhaps, therefore i would really reccommend you evloving it at level 49
Chat with our AI personalities
50
Lombre can evolve at any level because it doesn't evolve according to level, you need to use a Water Stone in order to evolve.
Lombre is one of the pokemon that do not evolve by level he evolves by using a water stone.
Lotad evolves into Lombre at Level 14.
any level, just let lombre hold the water stone and then train it to the next level