Re: Pokemon voices
In the games, it was probably just intended to be pure gibberish, and to help in the characterisation of the Pokemon (i.e. Charmander's sounds quite cute, but as it evolves, it gets darker). Also, Charizard and Rhyhorn have identical cries.
In the anime, though, Pokemon talk more often and show emotions, so the producers probably thought it best to not use the in-game cries, but to have them say their name. In Pokemon Yellow, Pikachu follows this, and you talk to him more often and he has emotions.
MK + Trainer17 = Evil twins | MK + Leo = BFFs