Level 22.
Yeah, don't get an evolved Sandslash. Train it up; it's worth the time. I have one on my winning team, of course, so I can verify.
Sandshrew evolves on level 22.
Sandshrew evolves into sandslash at level 22.
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Sandshrew evolves into Sandslash at level 23.
To evolve a Sandshrew level it up to Level 22 and it will evolve into Sandslash.
Sandshrew evolves into Sandslash at Level 22.
Sandshrew evolves at level 22in all games
Level 25.
level 24
raise it to level 22
sandshrew evolves at level 22 into sandslash
It evolves at level 22.
Sandshrew evolves at level 22 in both fire red and leaf green. But in order to get sandshrew on fire red version, you have to trade it
sandshrew evolves at level 22