Hey we all know that a mdefpdef gets half as much exp as other pets, in other words you need twice the amount of exp per lvl. However i have noticed this changes at some point in time.
Ok lvling my mdefpdef by killing monsters it still needs twice as much exp per lvl, however at a higher lvl (i dont know what lvl but mine was lvl 101 when i discovered this) drop exp ***** on it, you will notice it gains roughly 3 times as much exp from an exp ball than any other pets. Like my lanir will only get about 10% of a lvl while my mdefpdef gets almsot 30%. Thanks to all those double exp weekends i have enough ***** that by tomorrow i will have my mdefpdef 9 lvls higher than my char :-) and i used ALOT less than 60 *****, about 3.5 ***** per lvl or so...
I hope this helps other players out.