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"Catch a Dragon-type Pokémon"
Does evolving count? I can evolve a Seadra.
Hatching a Bagon doesn´t work, I found out earlier today.
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Any (Research Task) that says "Catch" requires you to actually catch it.
Which SUCKS, because I've got "Catch 3 Mudkip or Treeko" and I've hatched one of each and I really hate deleting any Field Research so this is hitting me right in my idiotic bullheadedness. (Also, once the Events end, there are a few places near my home where Mudkip and Treeko can regularly be found. So I kept it thinking I could finish it this week... ha. Oi.)
Edited for clarity