In Pokemon leafgreen, slowpoke either evolves into slowbro at Lv.37 or slowking, when you give it the item King's Rock to hold and then trade it.
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level 37Evolves into a Slowbro at lvl.37Level 37.
Slowpoke will evolve at Level 37.
Slowpoke into Slowbro: Level 37 Slowpoke into Slowking: Trade with King's Rock attached.
Slowpoke evolves into slowbro at level 37
You can't evolve Yanma in Leafgreen. This is because Leafgreen was made before Yanmega was made. So basically in Leafgreen, Yanma is a Pokemon that can't evolve.