Beat the game then face Marduk in the park then you can buy vladitor then go back to the park and it will say that he wants to face you again in the park beat him you will get battle ax vladitor
its kinda easy. i beat him using a pyrus attribute. u got to know which gate card to throw down an when to use ur ability cards cuz u only get 3. the bakugan i used to defeat vladitor was omega...
After you beat the game, beat Marduk in the park and you can buy Vladitor in the the store, then beat Marduk again and you can buy Battle Axe Vladitor in the store (he costs 100,000 BP).