Umm, they can own Twilight at base
base yes I did say because she had her powered up magic.
Also what Pinkie Pie has done should not be treat as a gag or joke, she has done that which would send most ponies reeling in confusion and uncertainty. He speed, ability to appear anywhere without reason, and her Pinkie Sense that can seemingly allow her to predict the future would give her a huge edge in battle.
you clealy mean besides her minor reality bending ability and strange eclectic knowledge? O and the proven ability to alter other ponies talents
for reference Minor reality bending two many pinkie pies rainbow dash noticed and commented on how she showed down in mid air before hitting the pond.
dam the episode with the parasprites she know what they where and how do deal with them
as for altering another pony's talents see the wedding episode part 2. just because some writers don't now what to do with a character you cant dismiss her know abbilites.