A thread about how abilities or type changes would be fine (as long as the two were kept distinct and simple, and the OP was given a fair amount of effort), but it doesn't belong in that kind of thread, which is for discussing Hydreigon's actual use and impact.
Does it violate anything for me to start a post about a discussion like that? I mean I know this is supposed to be about competitive battling, but I keep wondering what would happen if Hydreigon received a supportive ability like Salamence and Dragonite, and it seems like it could be a good discussion.
A fair point; I apologize for stating my opinion like that. However, I still do not think there is any merit at all to a discussion about whether or not Hydreigon is bannable without a Fighting-type weakness, and the post will remain deleted because of that.
Yes, it is not definitive, which is why I did not just say "would be banned" and instead said "I have a feeling". Valuable expansion for discussion is possible. In fact, I wanted someone to disagree so that I could have a chance to state my case. You are the one who is stating your opinion as a fact.
It doesn't contribute because it's baseless conjecture with no valuable expansion for discussion, and it is indeed wrong. If Hydreigon magically retained all of its properties besides the Fighting-type weakness it still wouldn't be banned.