Verse the Elite Four or Verse Red in Mt. Silver.
When Versing Red, you may choose to lose at the end of the battle when you get enough exp. points and battle red again and again.
-Chaz
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AnswerUnfortunately, the running feature was intoduced in Pokemon Ruby and Sapphire - the generation after Pokemon Crystal. This means that the fastest way of moving around in Crystal is by riding a bicycle, with the only other option of movement being walking.
Easy. Give him or her an Experience Share, then battle a high level pokemon.
The fastest possible way is to train a Pokemon someone else gave to you and have it hold lucky egg.
Battle trainers or wild pokemon, if that's not fast enough for you, use action replay codes.
Three female Dragonair, all level 37, and a female Kingdra, level 40. Clair is her real name, by the way, and she specifies in Dragon types.