you need a water stone for staryu to evolve into starmie :)
For staryu to evolve you have to use a water stone
Staryu can evolve into Starmie at any level, as long it is exposed to a Water Stone.
Staryu does not evolve by level. You use a water stone to make it evolve.
Staryu evolves into Starmie when given a Water Stone.
It evolves by use of a water stone, level has nothing to do with it.
staryu doesn't evovle you have to use a water stone
It Evolves with a water stone, you can get one from a scientist on a Pier in Castilia City.
You have to use a waterstone
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 64
Level 43
To evolve Mantyke in pokemon black/white 2 you have to level it up with a remoraid in your party then it will evolve into mantine