Ekans evolves into Arbok starting at level 22.
Ekans is #23 in the National Pokedex, and was introduced in the Generation I Pokemon titles (Red, Blue, and Yellow) where it could be found (Red only) on Routes 4, 11, and 23. In Generation VI (X and Y), it can be caught on Route 14 in a Horde encounter.
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Ekans evolves at level 22.
at level 22
ekans evolves into arbok at level 22
Ekans does not evolve with a stone. Ekans evolves by leveling it up. Once you level it up enough, it will evolve into an Arbok. It does not evolve any other way.
Arbok does not evolve into Seviper, it doesn't evolve after evolving out of Ekans. Hope I helped! :)