What does everyone consider to be the best attack of each type of move? Considering effect, power, and accuracy, many people vary this. Here is mine.
Normal-Super Fang- Almost always hits, and always reduces health by half.
Fire-Sacred Fire- Almost Always hits, powerful, and flip a coin. Call it right, you just burned the foe.
Water-Surf-Hits everyone, 95 power, 100% accuracy
Grass-Seed Bomb- Hits for 80 100%
Electric-Discharge-While it is weaker than thunderbolt, it has 20% more of a chance to paralyze
Ice-Ice Beam- Powerful, accuate, and can freeze
Fighting-Aura Sphere-Increadibly powerful and accurate. While it has nea the same effect of moves like overheat and superpower, it only reduces from defences, making it strong each time
Poison-Cross poison-Powerful, accurate, and can both hit criticals and poison. Plus, it is high in PP.
Ground-Earthquake- It's just that good.
Flying-Air Slash- While weaker than Aeroblast, I like it's huge PP.
Psychic-Extrasensory-While somewhat weaker than psychic, it's ability to cause flinching and it's extra 20 PP make it worth it.
Bug-Signal beam-while not as strong as megahorn or X-scissor, the ability to cause confusion makes me keep it.
Rock-Rock Slide-Accuracy is not common on rock moves, or PP. This move can cause flinching, semi-accurate, and decent PP.
Ghost-Shadow Foce- While it makes it easy for an opponent to switch to a normal type, this move hits protecting opponents and does big damage.
Dragon-Dragon Pulse-This is hard with Dragon Claw there, but 10 extra power for 5 less PP won out.
Dark-Dark Pulse- The ability to cause flinching beat Crunch's effect, making it my pick.
Steel-Iron Head-This move causes flinching, is powerful, and accurate.
Now you see my tops. Also, you can see I'm big on balancing PP and power. I also didn't include moves like confuse ray, calm mind, or memento, as I consider these 'moves' rather than 'attacks.' People deciding attcks may find these opinions helpful, and I'm curious, so I put this up. Remember though, match attacks with the pokemon, as I would prefer crunch over dark pulse for tyranitar for it's attack and Psycho Cut over Extrasensory for gallade. Thank you for looking at this and for any cooments or additions you make.

I guess these are pretty good moves
EarthQuake
Hp < kinda.. (Hidden Power)
Surf (Best Water Move Ever)
Return (perfect for friendship evolution pokemon when they like you)
Can't Thing of any more At The moment

~ElectroBeer

Fire: Flare Blitz (just plain awesome) {charizard}
Grass: Leaf Blade (good accuracy) {sceptile}
Water: Hydro Cannon (very powerful} {blastoise}

Every time someone else posts...
I post 3 more.[code]every post I post[/code]

To me the best moves are Earthquake,Thunderbolt,Flamethrower,Surf,Crunch,Erruption,Water Sprout,Psychic,Calm Mind,Bulk Up thats only a few

Some of my favourite moves include thunder,giga drain,water pulse,fire blast,solarbeam,shadow ball(rocks),EQ, psychic and sheer cold.

Electric=Thunder {pikachu}
Ice= Ice Punch {hitmonlee}
Rock= Stealth Rock ( the D/P version of Spikes) {geodude}

Aqua jet
Earthquake
stealth rock
i like em

I like outrage. I use it with my rayquaza and it PWNS. I dont like being confused afterwords, though, but whatever i just keep attacking.

Put on a persim berry.

I don't know all of the DP moves, so here's the list of my faves:

Normal: Slash. Like the high critical rate.
Fire: Flame Wheel. High PP and is one of the two moves usable to thaw yourself.
Water: <s>Surf</s> Water Spout. Surf used to be my favorite until in DP they ruined it with the 3 target thing. Now Water Spout + Kyogre = OHKO x2.
Electric: Thunder. Has good luck for me, and on Kyogre I ensure the good luck.
Grass: Leaf Blade. Now it's stronger in DP. On a side note, I do like the increase in PP of Vine Whip, Mega Drain, and Giga Drain. Yes, 10 PP instead of 5.
Poison: Toxic. Best move evah! Fear deadly poison!
Ground: Earthquake. Meh - there isn't much to choose from.
Rock: Ancientpower. I like the 10% of simultaneous stat raise.
Psychic: Extrasensory. What really drew me in was the high PP.
Fighting: Hi Jump Kick. Not much to choose from...besides, PP is good and it's powerful.
Bug: Silver Wind. Once again, simultaneous stat raise.
Flying: Wing Attack. Has high PP and it's strong. Also I like the raise in power of Fly.
Ice: Ice Beam. It's accurate and powerful, unlike Blizzard.
Ghost: Shadow Ball. Now that it's special, it can be used to full potential.
Dragon: Outrage. It would have been Dragon Claw, but they have the same PP! If Dragon Claw had 20 PP it would be better.
Dark: Crunch. Probably the best Dark move there is.
Steel: Metal Claw. High PP and a 10% chance of Attack raise.

Sorry for the out-of-order, I can't remember all 17 types at once (I remember about 14 then the rest eventually come along).

- DNA

I think the best all time move ever is Earthquake

I like water spout, but with it getting weaker as your hp goes down, I prefer surf. I tend to use moves and abilities in double battles, but I dont play those often. Pokemon with the ability water absorb, or with fly, dig, dive, and shadow force help, too. I do agree with the facts of attacks that boost stats, but with only 5 pp and 60 power, I tend to get rid of them.