Would the power anklet raise shedinjas speed above 40 or not? I know that the anklet promotes speed increase upon leveling, but would it actually help to use it on shedinja?
The Power Anklet raises how much Speed EVs you collect. So unless you are EV training this Item is useless. When this item is held by a Pokémon, the holder's Speed is reduced by 50%. For every battle it has, in addition to the Effort Values gained in the battle, it will gain 4 Speed Effort Values. Shedninja's Base Speed is 40 so if you give it a nature to Raise Speed and you give it 252 Speed EVs it will have over 40 Speed Stat.