You'd find me in a quiet place with nothing more than food, warmth and eight of the cutest Pokemon in 'existence'. Regardless of how hectic the world would be with Pokemon in it, if I could befriend an Eevee and one of each of its evolutions, I wouldn't care. XD I'd live in a place as far away from the dangerous Pokemon as possible.
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But really, it would be very difficult to place something depicted in a children's cartoon into a real life event. The one thing I can agree with, though, is that Government agencies would definitely try to either take Pokemon for their own, and use them as tools of war against their enemies...
"HA! We've got a Gyarados! Your Charizard is NO MATCH!"
Where there are positives, there are also negatives... and when you consider how bent and warped our world is... the more ridiculous an inclusion of Pokemon would sound. (not to mention the ridiculous instances of a Pokemon's habitat or eating habits, such as eating entire mountains, etc.)
In closing, sure... Pokemon would realisticly probably mean the end of the world, but it doesn't mean people can't think about it and add their own (positive) thoughts to it. My personal opinion on the idea is it'd be cool... dangerous, but cool... but the better thought would be "What would you do if you found yourself in the world of Pokemon?", rather than "What would our world be like with Pokemon?" Because threads about the latter yield pretty much the same old answers, over and over.
This wall of text was made especially for Oni Raichu/Rekhyt, who was starting to miss my walls of pink text. ^^