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While it has been surpassed, it was neat at the time and there are some cool details.
>Pokémon Trainer Hikaru/Cal is the default Trainer, and he uses the same sprite as you along with a level 50 team of Meganium, Typhlosion, and Feraligatr. He also has an unused level 10 team of Chikorita, Cyndaquil, and Totodile, and an unused level 30 team of Bayleef, Quilava, and Croconaw. In Gen II, while you would see all the evolutions of the starters you and rival picked, the third starter would never appear in your Pokédex without trading.
>The person with whom you last used Mystery Gift will have their party and name copied over, allowing you to battle them once a day without them actually being around.
>This Mystery Gift effect extends to Okuru/Carrie from Stadium 2, who will be randomly given one of three teams that includes the final stage of a Johto starter along with other rare Pokémon. Scizor and Porygon2 are not used by any Trainers in GSC, Gligar cannot be found and isn't used by anyone in Silver, while the circumstances to see Politoed and Heracross are pretty rare in-game.
I also have a bunch of random GSC Trainer trivia.