What system to take for a adaptation ?

Hello good gentlemen! I would like to adapt a system of a game to a post apocalyptic Pokemon world, this image in particular inspired me : It would be two ways : - the pokemons invade our current world or -the third war explode in the pokemon world where technology has advanced to fireguns and weapons  So i need an easy system (i am an expert player but a noob GM, sorry T T ), which can be applied to fights with two connected characters, one with weapon and the other with abilities. I was thinking of some tame/invoke system i encountered but they were all very simple :/ So do someone have an idea ? 

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This would make &nbsp;pretty bizarre Apocalypse World game :)&nbsp; Check out the first few videos of the Roll20 Apocalypse World game that Adam Kobel ran recently. They are on the Roll20 YouTube channel. &nbsp; &nbsp;