Can any bey technically be left rotating? I'm relatively new to all this and would like to learn more. If not any bey can be left rotating, how would I go about making a custom one that rotates left?

Unfortunately not since the original generation/HMS have most beyblades been capable of spinning both directions. So far in X we have only gotten right spin (clockwise) beys. We expect that there will eventually be a left spin bey, but it will involve special launchers designed to go that direction.

This would be great for me being left handed! I hope to find one some time