Techadon:

If you're having trouble defeating Techadon use Echo Echo because he is to small to be hit by the lasers but if you get to close he'll kick you but if you are far enough away press A. Now before he starts flying and shooting at you stay still until they're just about to hit you then run to wichever end is further away from you and wait and if you think a laser will hit you jump. If you see he is launching bombs do the same thing.