It won't have evolved if it was holding an everstone or if you pressed B when Oshawott was evolving.
Dewott at Level 17
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Yes, Oshawott will evolve into Dewott at level 17 and again at level 36, it will evolve into its final form, Samurott.
Like most starter Pokemon, Oshawott evolves at level 16 into Dewott and then into Samurott at level 36
Oshawott evolves to Dewott on level 17 (Dewott evolves to Samurott on level 36)
lv.17 then to samurott at lv.36
Oshawott evolves at level 17 into Dewott and then at level 36 into Samurott.
You have to beat the whole game
Level 17
17.It evolves the first time into Dewott at level 17, and then again into Samurott at level 36.
Level 17 Oshawott evolves into Dewott. Level 36 Dewott evolves into Samurott.
18 that when mine did