I know that scyther loses speed after evolution but what about some others?
Nincada >>>>> Shedinja (loses HP) Magneton>>>>>>>Magnezone(loses speed) Larvesta>>>>>>>Volcarona (loses attack) Electabuzz>>>>>>>>Electivire(loses speed) Murkrow >>>>>>>Honchkrow (loses speed) Poliwhirl>>>>>>>Polwrath (loses speed) Trapinch >>>>>>> Vibrava loses attack (but Vibrava >>>.. Flygon gets it all back.) Caterpie >>>>>>>Metapod (loses attack) Scyther >>>>>>>>.Scizor (loses speed) Wingull >>>>>>>>.Pelipper (loses speed) Remoraid >>>>>>>Octillery( loses speed) Onix >>>>>>>>>>> Steelix (loses speed) Anorith>>>>>>>>>Armaldo(loses speed) Magikarp>>>>>>>>Gyarados(loses speed) Evidently Shelgon >>>>>>. Salamence loses defense)
Will keep adding more