UPDATE: by this date this quest is no longer doable without spending in kanto, as now the dratini spawns have been changed and the ONLY place in kanto they spawn is in a membership limited area in safari zone - so be prepared to either buy a mount or wait long enough to get bored/burnt out on the game to maybe get this (end of johto at earliest, too long!)... imo this quest is no longer worth doing, by the time youll be able to complete it without spending you would already have the bike instead (for free) or be better off just buying a mount (im sure this was intended) - just so everyone knows.