Staryu does not evolve by level. You use a water stone to make it evolve.
Chat with our AI personalities
For staryu to evolve you have to use a water stone
Lairon evolves at level 42-45 in Pokemon Emerald version.
staryu doesn't evovle you have to use a water stone
You can evolve Staryu at any level however it learns it's last move at level 52. The best time to evolve Staryu is to decide what moves you want it to have and see if it can learn any of them from leveling. Once the Staryu has the exact moves you want it to have as a Starmie, then is a good time to evolve it.
Rhyhorn evolves into Rhydon at level 42 in Pokemon Emerald Version.