Transninja sometimes has an appetite for mouse pokemon, some small snake pokemon, small turtle pokemon, and/or even small frog pokemon to sate his stomach. His Favorite pokemon to nom is rattata and/or radicate since they are a nuisance since there are so many of them so he noms some doing some inhabitants a favor getting rid of the pests when they get into people's homes or other places. Some pikachus and Raichus can be bad at times as well so he noms them at times when they become a problem but innocent ones he leaves alone if they arent a problem. Snivy and other types of snakes that like to hunt at times and nom others Greninja sometimes helps clear them out as well by nomming them but only a few he leaves some alive so they can thrive and still have a place to live. On very rare Occasions he will eat some turtles that are causing trouble for some but usually leaves them be since there arent many of them. Also on very rare Occasions noms small frogs as well if they dont learn a lesson or just plan a nuisance but he hardly ever has to since he wants frogs to thrive. But one day he finds Irene an Alolan raichu what he thinks is causing trouble easily sees through his psychic illusion and noms her up as you can see on his belly bulge but this one doesnt fight back too much and Transninja sees the raichu has given up too easily and lets it live but wants to keep her in there for now to satisfy his hunger.

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Transninja is mine and might make an alolan raichu sometime in the future

Greninja and Alolan Raichu owned by Game Freak and Pokemon Company