Marrill evolves once into Azumarill at lv.18 but Azurill evolves into Marill by leveling it up on a high friendship level.
It depends in how many times you use it in battle, if you use him allot and he levels up soon he will evolve.
According to some calculations Marill will need 17,562 experience points to level up to reach level 29 and evolve.
Azurill evolves into Marill at level 12 in Pokemon Indigo/UnovaRPG.
It is in the 20's.
It depends on the pokemon you're asking about. Many evolve at different levels.
2 Times.
You can evolve your chao 2 times so you can get a chaos chao so 2.
Many Pokemon evolve at certain levels. Some don't even evolve with level!
It should evolve at level 30, if it doesn't it's a defect.
Once
one
Skarmory does not evolve.