LEVEL 7,8,9
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.
Butterfree learns confusion at level 12.
lv 16
Staryu does not evolve by level. You use a water stone to make it evolve.
Kadabra learns confusion. *This occurs at LV16
Level 10.
LEVEL 7,8,9
Butterfree learns confusion at level 12.
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.
Level 8
Staryu evolves into Starmie when exposed to a water stone. The earlier the level it evolves, the longer it takes to learn good moves.
lv 16
Splash, it also depends on version, if you have the special edition of fire red (I do) it is splash
Staryu does not evolve by level. You use a water stone to make it evolve.
staryu doesn't evovle you have to use a water stone
In Red and Blue, it learns Confusion at Level 12, two Levels after it evolves from Metapod. In every other game, it learns Confusion at Level 10, as soon as it evolves from Metapod.