Level 18 is when Marill evolves into Azumarill, azurill evolves into marill at max friendship (generally reached at or after lvl 18 depending on how much berries/pokeblock you give it)
Marill evolves into Azumarill at level 18.
Marill evolves at Level 23 into azumarill.
Marill evolves at level 18
Marill evolves into Azumarill at level 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
Marill evolves into Azumarill at level 18.
Marill evolves into azumarill at level 18
Marill evolves at level 18
Marill will evolve to Azumarill at level 18
Marill evolves into Azumarill at level 18.
Marill evolves into Azumarill at Lv 18.
Marill evolves at level 18.