-P-
Paras: from PARASECT, into which Paras evolves
Parasect: combination of PARASITE and INSECT. Parasect is a mushroom-like Pokemon. Many varieties of mushrooms are parasites, meaning that they live attached to other living things - usually trees. Unlike a mushroom, Parasect has many legs, like an insect. However, it looks a lot like a crab, which is not an insect.
Persian: PERSIAN is a breed of long-haired cat. PERSIAN actually means "from Persia" which today is called Iran. Presumably, Persian cats originated in ancient Persia. The Pokemon called Persian is a cat-like Pokemon.
Pidgeot: a variation of PIDGEOTTO, from whom Pidgeot evolves.
Pidgeotto: a variation of PIDGEY, from whom Pidgeotto evolves. The -OTTO ending is similar to Italian forms, but it is unclear what, if anything, Pidgeotto has especially to do with Italy. Maybe he was born there.
Pidgey: a variation of PIGEON, a bird that Pidgey resembles.
Pikachu: from the Japanese PIKA, a mouse-like animal. Similarity to the English phrase "peek at you" has aroused the curiosity of scholars, but no direct linkage to that phrase has been established.
Pinsir: from PINCER, a pointed appendage used for spearing and grabbing. Pinsir has two pincers on his head, and several on his feet.
Poliwag: combination of POLIWOG meaning "tadpole" and WAG. Thus, a Pokemon that looks like a tadpole with a long tail to wag.
Poliwhirl: combination of POLIWAG (from which Poliwhirl evolves) and WHIRL, referring to the spiral marking on Poliwhirl’s chest.
Poliwrath: combination of POLIWHIRL (from which Poliwrath evolves) and WRATH meaning "anger". Thus, an angry version of Poliwhirl.
Ponyta: from PONY. Ponyta looks like a pony. The origin of the -TA ending is obscure.
Porygon: variation of POLYGON, meaning "many-sided plane figure". Triangles, rectangles, and pentagons are examples of polygons. Porygon is made by computer graphics, and polygons are some of the basic computer graphic building blocks.
Primeape: combination of PRIMATE and APE. The primates are an order of mammals that includes apes, chimpanzees, and man.
Psyduck: Combination of PSYCHIC and DUCK. Thus, a Pokemon with psychic powers that looks like a duck.