To beat maleyne you need strong flying or psychic Pokemon. I would also reconmend a fire or ground type to beat her lucario. Gliger, Staraptor,or a ghost type like rotom will work fine. If you have the secret key you can transform rotom into Rotom H (Heat)and it will learn overheat to beat her Lucario. Your Pokemon have to be around level 30-33 to beat her.
kill all her pokemon.
by knocking out all his/her Pokemon
you fight it and defeat it w/ ur Pokemon
use the move nuclearbomb
Just get STRONG Pokemon
go to the Pokemon league and defeat them
With a Budew.
w8 for platinum or get diff game i ges
use a flying , poison or flying Pokemon
Defeat the 8th
You have to defeat all the trainers and find all the Pokemon
No, After U Defeat Him In Diamond/Pearl/Platinum U Defeat Him He Compleatly Dissapears