Full disclosure, here at the start: I don't know Pokemon.
That's not technically true; here's a list of everything I knew about Pokemon before playing the new smartphone app, Pokemon GO (this knowledge absorbed solely through cultural osmosis, given the phenomenon's ubiquity).
1. Pikachu is a kind (species?) of Pokemon. It is an "electric-type" Pokemon. It is yellow. It has a cutesy voice. Said voice is profoundly annoying.
2. Squirtle is another kind of Pokemon, a "water-type" Pokemon. It, as one might imagine, squirts.