Keep/Change/Delete

[colours]

I'm largely indifferent to this, so I'll say keep for now.

Eruption

 

[Ebail]

I'd say keep. But if anything as far as changing it I'd like it to become available to some more Pokemon.

Frost Breath

 

[Rainami]

change. Make its base power 65. That way it has an effective base power of 97.5, giving it reason to be used over ice beam. Alternatively, change its accuracy to 95%.

fluffy

 

[toastghost]

keep. i love stufful and wooloo, and it's a cool ability

hold hands

 

[Nicolas721]

Delete, it's completely useless. All I can think of to make it more useful is making it some kind of Helping Hand but I doubt it would be worth it. Maybe it could give lots of friendship points?

Dive

 

[Rainami]

change. Thematically it only makes sense for the charge turn to remain, but its power could stand to increase to at least 90 to help make up for that. I think 90 or 95 bp sounds fair. Maybe even make it break through protect/detect like phantom force does, wynaut.

scald

 

[Ebail]

Keep. It's power is fine, and I do like how high that burn chance is.

Rivalry

 

[colours]

Honestly, I'd just delete Rivalry. It... doesn't offer any real benefits and it's an actual detriment when an opponent sends out an opposite-gendered Pokemon.

Synchronize

 

[Cresselia92]

Keep. Essentially a must for looking for a specific Nature, and it can also act as a deterrent against status from some users. At most, I’d change it a bit so that it heals from status after some turns, so that your own Synchronizer isn’t hampered too much.

Aeroblast

 

[Vulpix037]

Keep as it is, but revoke it's status as a signature move (i.e. Allow other Pokémon to learn it)

Rock Head

 

[Rainami]

keep. It's a fine ability so long as the pokemon that get it learn useful recoil moves. I see no reason to delete or change it.

nuzzle

 

[Vulpix037]

Change. The base power is far to low. It should at least be doubled.

Dual Chop

 

[Isaac the Investigator]

Change, Base Power should be 60

Neuroforce

 

[colours]

Keep. Although it on Ultra Necrozma is....ehhhhh. Would've liked it on any other Pokemon for a nice change.

Light Metal (ability)

 

[Isaac the Investigator]

Delete, is useless 99.999% of the time and these Pokémon can use better abilities

Diamond Storm

 

[Gengarzilla]

Pretty firm keep, it's a perfectly fine and appropriate signature move. Now if only Diancie got Play Rough too...

Stealth Rock?

 

[toastghost]

Keep. It's a good move that can cripple a team.

Flash

 

[colours]

Delete. After it became a TM, it became essentially useless aside from maybe illuminating the odd cave here and there.

Zap Cannon

 

[Ebail]

Change. I'd like to see it have a bit more of a chance to hit, in exchange it's power could be dropped to compensate for that increased accuracy.

Swagger

 

[Gengarzilla]

Change, give it 100% accuracy or a +3 Attack boost in light of Gen VII's confusion nerf.

Fly?