First of all, there's Hydreigon, a Generation Five Pokemon that is already a Dragon-type Pokemon, that is partially based off of the Hydra. Secondly, The Indigo Disk DLC later introduced Hydrapple ...

This would naturally lead him to seek out Dragon-types ... name of Son Goku, a young peculiar boy with a tail who embarks on a quest to become stronger and learns of the Dragon Balls, when, once ...

Salamence is one of the Pseudo-Legendary species of the Pokemon franchise ... as Salamence is typically a Flying/Dragon-type. The event only drops the Dragon typing, leaving it wide open to ...