you might wish to study what real magick is and what real magick is capable of. [you might also wish to look into astral projection and thought-forms]
magick is natural, and works within nature to create a desired change. pokemon are fictional, right off the bat maigck cannot do what you seek. but lets go out on a limb and for argument sake you want to summon a puppy [puppies are physically real beings] the spell would still fail because magick cannot create something out of thin air. you could cast a spell to help you convince your parents to let you get a puppy, but you cannot say some words and *poof* a puppy appears in front of you.
Pokemon is an anime. Anime much like Hollywood movies and other fantasy tv shows are not realistic portrayals of how magick actually works. Just as you cannot shape shift, change your dna, teleport, bend the elements, and so forth. There are many sources on legitimate spiritual practices. Such as grounding, centering, meditation, astral projection, candle magick, chakras, and the list goes on and on! For books there are oh so many good authors such as Scott Cunningham, Donald Michael Kraig, Raymond Buckland, and so on. With a simple google search of their names with pdf on the end you can find many of their books online. I would suggest maybe trying Modern Magick by Donald Michael Kraig for starters.