Idea to do a little switch up to the starters for a gen, instead of starting out Grass Fire Water, the player the rival and their friend are all given the same type, a Dragon called Pryu, which will become a Dragon/Fire Dragon/Water or a Dragon/Grass depending on which elemental crystal it ate at the start of the game,
Pryu+Fire Crystal yields Embryu then Inferyu
Pryu+Water Crystal gets you Watryu then Toryu
Pryu+Grass Crystal means Baryu then Foryu