Who is Better: Mega Diance or Hydreigon?

Both of them are super strong or even overpowered wall breaker, and I wants to use a very successful wallbreaker, and this two are the only two i’ve want, and the format is Gen 8 national dex.The moveset i’ve wanted to use on them:Diancie-Mega @ DianciteAbility: Magic BounceEVs: 4 Atk / 252 SpA / 252 SpeHasty Nature- Earth Power- Psychic- Power Gem- Diamond Storm

Hydreigon @ Choice ScarfAbility: LevitateEVs: 252 SpA / 4 SpD / 252 SpeTimid Nature- U-turn- Draco Meteor- Dark Pulse- Flash Cannon

If the move sets are not good, please tell me what should I change!

Pleaselog inorregisterto add a comment.

Hydreigon is better, for several reasons.

Hydreigon is in a higher NatDex tier, Diancie-Mega is allowed in National Dex UU, while Hydreigon is not.

Hydreigon doesn’t take up a mega slot.

Diancie has three very common weaknesses in Ground, Steel, and especially Water offense with Rain teams.

Diancie is picked off easily by priority moves like Bullet Punch, Water Shuriken, and Grassy Glide.

I’d say the only moveset change to Hydreigon is to change Flash Cannon to Flamethrower to hit Ferrothorn (and various other Steel types). You already lose to Fairy types unless they are really really weakened, so you don’t really need Fairy coverage.

Hope this helped!