At Pokemon emerald has a secret tunnel called tunnel of secreds you get one evolution stone
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Once it is a level 24, it will evolve into Ariados.
Spinarak will attempt to evolve into Ariados once it reaches Level 22.
Spinarak evolves into Ariados at Level 22.
Spinarak evolves at level 22 in to an ariados.
Capture one in the Safari Zone, and it should already be past the evolution level. Just raise it up one level, and it should evolve into Ariados.