You can copy and paste this into Item PBS (note that these are not all the mega stones) :
529,ABSOLITE,Absolite,Absolites,1,1000,"One of the mysterious Mega Stones. Have Absol hold it, and this stone will enable it to Mega Evolve in battle.",0,0,0,
530,GALLADITE,Galladite,Galladites,1,1000,"One...