Lv.28
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Lv 26
Rhydon at Lv 42.
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.
Both forms of Nidoran evolve at lv. 16, but you must have a moon stone to get it into a Nidoking or Queen. Hope this helps
I'm surprised you don't know this Ivysaur was in Blue, Red, Yellow, Firered and Leafgreen LV. 32