Welcome to The Cave of Dragonflies forums, where the smallest bugs live alongside the strongest dragons.
Guests are not able to post messages or even read certain areas of the forums. Now, that's boring, don't you think? Registration, on the other hand, is simple, completely free of charge, and does not require you to give out any personal information at all. As soon as you register, you can take part in some of the happy fun things at the forums such as posting messages, voting in polls, sending private messages to people and being told that this is where we drink tea and eat cod.
Of course I'm not forcing you to do anything if you don't want to, but seriously, what have you got to lose? Five seconds of your life?
Kyogre, because it is the only one that looks like it will kill you.
Hm, but Groudon has super big claws that can rip everything apart. And it can step on you, crushing you with its weight. It also has lots of pointy, sharp teeth. Rayquaza, on the other hand, is a dragon thing, which gives it automatic plus points in the "I kill you" category. Kyogre is just a large whale/dolphin thing. It doens't look like it will kill anyone at all.
There's also the fact that too much heat = instant death. You'll be burned to a crisp and die of dehydration and burns. All the water will evaporate, and land mass will expand.
Now, now, I'm not saying Kyogre is bad -- it does kick ass. Very much ass. My absolute favorite Pokemon to use in all my Pokemon games is my Kyogre, who can wipe out my friend's team in only a few minutes. I also like Kyogre's design very much.
The thing is that, I love all of them, because they're all unique in their own way and awesome.