I agree with everything sumwum said, but I would like to suggest choice scarf instead of specs, so that you can outspeed even more things, as magneton's defenses are pretty garbage, and earthquake is an incredibly common move, though then you should definitely keep modest nature to have higher special attack. The reason to replace porygon is that blissey is purely special, and it seems like arcanine has the physical side of tanking pretty covered, though definitely get rid of roar, as there is no reason to run roar on something with intimidate. The set I like the most for kommo-o is dragonium z clanging scales for a mega boost, so that you can sweep late game, and run a mixed set with clanging scales, close combat, poison jab, and outrage.
