>>34678047On the left, the trading process. It was planned that the trainers trading their Pokémon could press a button on the D-pad while the transfer animation was going on to send some simple messages ("Please take care of my *insertpokémon'snicknamehere*" or "*Pokémon'snickname*, I'm going to miss you") during the process.
And on the right, you can see that, originally, the pokéballs were not hinged, but part of them would slide under the other half. Bellow that, you can see a shady fatso trying to sell some Pokémon. Was he a breeder? Did that evolve into Celadon's Prize Corner? Is that a Poké-fetus in a jar behind him?