This question belongs in Questions about the WBO, but that's more of a Your Creations thing since it's obviously not legal. Of course, it's relatively common as seen with users like AkirasDaddy and such, but no we don't discuss that here in Beyblade General. You can make your own thread in Your Creations.
As for your other question, the best Attack type bey would probably be MF-H Flash _____ (Scorpio/Pisces/Orion) S130/H145R2F. I'm assuming you mean in a BB-10 Attack Stadium, and there hasn't been too much testing on Zero-G that can be seen as conclusive evidence for the power of beys, though Dragooon and Phoenic show potential. These answers can be found in the Advance Forum under the Competitive Metal Fight Beyblade Combos topic or in the Zero-G subforum under Beyblade Customizations.
"In many ways, the work of a critic is easy. We risk very little, yet enjoy a position over those who offer up their work and their selves to our judgment. We thrive on negative criticism, which is fun to write and to read. But the bitter truth we critics must face, is that in the grand scheme of things, the average piece of junk is probably more meaningful than our criticism designating it so. But there are times when a critic truly risks something, and that is in the discovery and defense of the new. The world is often unkind to new talent, new creations. The new needs friends. Last night, I experienced something new: an extraordinary meal from a singularly unexpected source. To say that both the meal and its maker have challenged my preconceptions about fine cooking is a gross understatement. They have rocked me to my core. In the past, I have made no secret of my disdain for Chef Gusteau's famous motto, "Anyone can cook." But I realize, only now do I truly understand what he meant. Not everyone can become a great artist; but a great artist can come from anywhere."
-Anton Ego/Peter O'Toole (1932-2013)