Against skarner, Skarner can start ganking at level 3 or 4 and can also take the Void Grubs very easily.

His first major power spike is level 6 though, when he unlocks his Ultimate. His Ultimate will result in him looking for picks and trying to make plays as often as possible.

Try to end the game as early as possible. The longer the game goes, the tankier he will be. The only way to counter this is by ensuring you get pen items.
 Against skarner, Skarner can start crashing at level 3 or 4 and can also take the Void Grubs very easily. Its first major power peak is level 6 however, when it unlocks its Ultimate. Its Ultimate will result in the search for choices and try to make games as often as possible. Try to finish the game as soon as possible. The more the game goes, the tankier it will be. The only way to counter this is by making sure you get pen pieces.