Any Skeleton in the Wilderness will remain aggressive towards you despite your combat level or how long you've been there.
These are fairly good training for lower level players, free or members. Crumble Undead is a extremely powerful spell against skeletons. Also, if you're a member and have the salve amulet you get 15% attack and strength (20% if salve amulet (e)) bonus which makes killing these very efficient.
Could do with gaining a few pounds.
Skeleton champion scroll
Bones (100%), Coins (2-25), Grain, Iron dagger, Bronze arrow (2), Iron arrow (1), Fire talisman, Grimy herbs, Chaos rune, Earth rune, Uncut gems, Steel dagger, Steel sword, Gold Charm, Blue charm