Graveler evolves into Golem only when traded.
lv 55
Lv.16
Pidgey --> (lv. 18) Pidgeotto --> (lv. 36) Pidgeot
Mankey does evolve at lv. 28 in Fire Red / Leaf Green
your pidgey will evolve at level 18 and your pigeotto will evolve at lv 36
Pidgey Evolves to Pigeotto at Lv. 18 Pidgeotto Evolves to Pidgeot at Lv. 36
Nowhere, to get one you need to evolve a dratini into dragonair at lv.30 and then in to dragonite at lv.55
Psyduck evolves to Golduck at Lv. 33.
I don't know when but he evolves to gravaler.
lv 36 forget what the other person said
Just level it up to Lv.20 or over! simple.
Graveler doesn't evolve by level, you have to trade back & forth