When Pokémon is released, the first generations appeared that had only three Dragon type Pokémon: Dratini, Dragonair and Dragonite. a trio of creatures belonged to the same evolutionary line of the Pokemones.
The mission was to capture a Dratini and evolve Dragonite was a powerful Pokémon with one of the most fearsome types of the game, which is why this pocket monster became a very coveted by anyone who aspired to prevail in the most competitive aspect.
Although thanks to Megaevoluciones, Pokémon as Charizard can adopt the type Dragon. Same as Exelautor of Alola were also a Dragon type, although in both cases were mixed with Fire and Plant, respectively, so if we want a Pokémon that is purely Dragon type, we will have to aspire to get a Dratini or some of their evolutions.
Dratini To find it we will have to go to the river of Route 10 that takes us to the Power Plant until a Dratini deigns to appear.
The possibility of capturing it is low because it is shown in the wild where Dratini is, the odds of it appearing is (1%) it is recommended that you level up a Dratini until 30 to evolve.
To achieve the mighty Dragonite you must train a Dragonair until you reach level 55 and evolve, although there is also the possibility that it appears in the wild after becoming the champions of the Pokémon League. It can appear in any outdoor area and to face it they will have to fly with a flying mount, since it always shows up in the sky. If you make a Pokémon streak and use a Colony, you increase the chances of it appearing.