Druddigon

Druddigon is cool looking Pokemon to many players, but an inferior one in the meta scene. Its stats and moveset are subpar compared to existing Pokemon like Rayquaza or Salamence, making it a dex filler for pro players, and a budget option for newer/returning players. It's not a bad Pokemon, but probably not worth the resources. 

Best PvE Offensive Moveset

• Dragon Tail benefits from STAB, and is the superior choice for PvE offense. 
• Bite has no use. 
• Dragon Claw pairs well to fulfill a Dragon-type role, and deals consistent damage as a 3-bar move. 
• Night Slash could have some use as a secondary Charge Move for clearing gyms, but doesn't fit Druddigon's main role. 
• Hyper Beam is too slow and can't be Super Effective against anything. 

Best PvE Defensive Moveset

• Dragon Tail is preferred for defense due to its significantly higher base power. 
• Bite is a poor move for defense.  
• Night Slash is more favorable for defense due to its neutral hit against Steel-types.
• Dragon Claw has the best damage output against neutral attackers, but is doubly resisted by Fairy attackers. 
• Hyper Beam is too slow and can't be Super Effective against anything. 

Dragon Tail is superior to Bite in both damage output and energy generation, not to mention also benefiting from STAB. 

Dragon Claw and Night Slash both cost very low amounts of energy, allowing them to be used frequently. The former hits harder against neutral opponents thanks to STAB, while the latter is useful against popular Steel-types who would resist Dragon-type damage, in addition to extra threat against Psychic and Ghost Pokemon.