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This is gonna sound ironic, but it's not an actual reality based game, you catch monsters in a different dimmension for lulz sake.
I don't really think it matters if the Pokemon know how to talk or not so long as the main story of the game makes some sense.
http://www.pokecommunity.com/showthread.php?t=35696
I'm not sure if you've read it, but it looks like a quick tutorial on the basics.
So, what things are you currently planning to put into it?
Actually, now that I think of it, in the third generation and up, Splash might be a good attack if Magikarp is like at Lv. 100.
You could find a legendary Pokemon, lower it's health with one Pokemon, switch out to Magikarp, and keep using Splash and potions until the timer ball has it's max...