I’ve raised dragon Pokémon like salamence, flygon, and garchomp from eggs and recently was gifted a jangmo o and he acts a lot differed from the other dragons. He’s playful like a puppy rather than more territorial and extroverted. Why is this?

Although a researcher’s descriptions of a pokémon’s disposition may be a general overview, there are always outliers. Just as humans aren’t all social, outgoing, and so forth, not all pokémon are a specific set of traits. Gyarados aren’t always violent and angry, chansey aren’t always altruistic, and jangmo-o aren’t always territorial.

That having been said, it sounds like you were rather lucky. A playful, puppy-like pokémon may be easier to bond with and thus train as it grows. Take this as an opportunity to start off on the right foot, so to speak. Just be sure that your jangmo-o integrates well with the rest of your team, and you’ll be fine, anonymous.

Best of luck!