Although Hydreigon is definitely still a big threat to almost any team, the faster, more offensive metagame takes a significant hit on its viability. Despite lacking Superpower + Roost, I'd argue that Hydreigon was more effective in the BW1 metagame because everything was slower and bulkier, meaning its base 98 Speed was more of an asset, and could tear through teams lacking one of the pink blobs with its Sub + 3 attacks set or even its 4 attacks set. It was an amazing answer to the dominant Volt-Turn teams of the time. Nowadays, there's far less it can come in safely on, especially with so many Fighting attacks being thrown around. Of course, once it gets in, it's still a monster, but it just doesn't have the same impact it once had, and has to tread carefully in this dangerous new metagame. It also has competition from Kyurem-B (and Garchomp to an extent) as a wall breaker, though not being SR weak and having a less predictable movepool still gives it an edge. Hydreigon can be tough to use, but can still be incredible on balanced teams which need something to break down defensive cores with ease. It isn't so useful on HO teams though, nor does it match up particularly well against them.
i also use a stall (or semi-stall) team and for those ridiculous mons that i can't always wear down easily hydreigon does just the trick. it suits a slower-paced team definitely.










