I'll talk about Pokemon Showdown stuff here.

My favorite format is Mix and Mega, so here's some fun sets of my favorite Pokemon to use for it:

Some info on these sets:

• With Charizardite X, Guzzlord keeps its originally good typing and gets some decent stats for once and gets the ability Tough Claws, which can be really useful.
• Since Guzzlord's HP is so high and its defense is so low, It'd be better to put the EVs in defense rather than HP
• Dragon Claw can be replaced with Outrage if you want more damage, but I wouldn't advise it, as it can be easily predicted.
• I put the - in Blacephalon's sp.def rather than defense so it has a miniscule chance to survive a physicaly priority move. It's not much, but It's something.
• Golisopod's Drill Run can be replaced with Swords Dance if you want more damage and aren't worried about Groudon

Here's another fun set I thought of

• Cross Chop can be replaced with Brick Break if you care more about accuracy than power
• The same goes for Rock slide over Stone Edge

Dragon/Steel Haxorus

Haxorus @ Aggronite Ability: Rivalry EVs: 252 Atk / 4 SpD / 252 Spe Jolly Nature - Dragon Dance - Dragon Claw - Iron Tail - Earthquake
• Outrage can be used over Dragon Claw for more power, but beware of Fairy-types and predictability