It does not envolve. Azumarill is the final evolution of azurill.
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Azumarill
Marill will evolve to Azumarill at level 18
Marill evolves into Azumarill at Lv 18.
Find a Marill in the wild and evolve it into an Azumarill. I think Marill evolves around level 25. marill evolves at level 18 in sapphire
Azumarill learn Hydro Pump at level 57.