For the inexperienced, the Deva can often damage and kill the user just as well as the target. Get used to its movement scheme, as taking an accidental hit from this weapon is lethal.
One strategy involves use of the Deva Bomb on small lava-enclosed stages where the user can then play the game of who takes less damage.
You do not want to get hit with this extremely powerful bomb. Just a few hits, and you will lose the match. Focus on jumping away from every single bomb to counterattack the enemy at mid-range.