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I think Gamefreak shoot themselves in the foot by trying to make Pokemon into beings naturally inhabiting a world similar to ours. It may superficially work with bird, vermin, fish etc. Pokemon, but then we have living magnets, lava snails, all kinds of stuff that appears to be based on man-made objects and a hundred of mythical/legendary Pokemon. Trying to give them all place in the ecosystem just doesn't make sense and they even had to go for "Pokemon from another dimension" to make something different.
Digimon, Yokai Watch and all other monster raising games make much more sense in that regard. Pokemon could use at least a soft reboot to tidy things up.