>>18927359Hydreigon is banned from UU, even in the age of fairies. So it's got that going for it.
Druddigon is absolute shit, only use it if you've lost a bet.
The best Dragon-type for PvP is Palkia if you're allowing Ubers, Mega Charizard X if you're willing to dedicate a Mega slot, or Garchomp if you're just seeking a standalone. Note that Hydreigon is viable in OU if you're not a retard
hint: keep it away from Fairies, just like you keep Tyranitar away from punches, while Druddigon is, again, only to be used if you've lost a bet.