there is alot of trainers south of blackthorn city. defeat them or find all the rare canies in the game
Sandshrew evolves at l.22 in pokemon crystal
Clefairy doesn't evolve by level, you'll have to use a moonstone on her.
Slowpoke Well Basement level 2 by surfing. http://www.upokecenter.com/dex/?version=crystal&name=SLOWBRO
In pokemon crystal Pigeotto evolve in 36lvl
level 22
100
Mareep will evolve at Level 15 in Pokémon Crystal.
It evolved level 23 in the Crystal version.
level 30
Level 36.
The Level When You Get A Life.
In Pokemon Crystal, Cyndaquil learns Ember at level 12.