Question

Are there any 100 accuracy decently powered rock type moves?

Answer 1

No, in fact there aren't.
Even rock throw doesn't have 100 accuracy!
It may be ridiculous but its like that.
Besides Smack Down, it has 100 accuracy.
Look for yourself.
Although, Power Gem and Ancient power ( These are special moves ) Have 100 accuracy

http://pokemondb.net/move/type/rock

Comments

Power Gem is quite useful for special attackers. Aside from that, Stone Edge is the one to go for if possible, otherwise Head Smash or Rock Slide.

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Also Hidden power rock.

Answer 2

• Mightly Cleave: 95 BP, physical. Only learned by Iron Boulder.
• Ivy Cudgel: 100 BP, physical. Only learned by Ogerpon; needs to be holding Cornerstone Mask.
• Multi-Attack: 100 BP, physical. Only learned by Silvally; needs to be holding Rock Memory.
• Judgement: 100 BP, special. Only learned by Arceus; needs to be holding Stone Plate.
• Power Gem: 80 BP, special.
• Tera Blast: 80 BP, physical or special depending on user's stat. Need to be Terastalized into Rock-type.
• Revelation Dance: 90 BP, special. Need to be Terastalized into Rock-type.
• Weather Ball: 100 BP, special. Must be used under Sandstorm.
• Natural Gift: BP varies depending on berry held, physical. Wiki Berry (80), Magost Berry (90), Charti Berry (80), Micle Berry (100)
• Hidden Power [Rock]: 60 BP, special.
• Ancient Power: 60, BP, special.
• Smack Down: 50 BP, physical.
• Salt Cure: 40 BP, physical.
• Accelerock: 40 BP, physical.

Source: /nms acc=100, rock (Pokemon Showdown! command) and Bulbapedia

Comments

I think because "decently powered" wasn't defined, you can also include Hidden Power [Rock], Salt Cure, and Smack Down.

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Good point, thank you.