Hmm, it all depends.
To root it to about pure Data, is not the way to play the Games. You have to acknowledge each Pokemon as a unique Creature; no matter what form its in! And, you have to acknowledge each Character that you occupy as being a portion of yourself. Wherever you bring that Pokemon, it will see a new World. A new Land, new Trees, New Water, etc.
Usually though as a kid, it was because my Brother wanted to Duel me with the only Game I had Pokemon in! Gold Version! So he'd bring in his Zapdos, Mewtwo, etc. All the usual coolies of the 1st Generation.