Haunter Evolves by Trade.
level 26
Gastly > lvl 25 > Haunter > trade evolution > Gengar
it evolves by friendship. it does not evolve by level,stones or trades.
I think it Evolve In level 100
Tyrogue evolves at level 20, but can evolve into different pokemon. If: (stats) attack > defense --> evolve into Hitmonlee attack < defense --> evolve into Hitmonchan attack = defense --> evolve into Hitmontop
level 20
Level 20
level 25
the only pokemon to be able to evolve is a level 54 danyon
36
kakuna
16