-------------------------------------------------------------
*Edit* The strongest move may be that, but Arceus is a legendary, not a common type Pokemon. For normal Dark type Pokemon, the strongest move would be Night Daze (85 power). It is often confused with Foul Play, but this move does not actually have 95, it's the target's attack stat. So sometimes it varies.
Of the 14 Damage Dealing or Physical Dark moves, the strongest are:
With Power 80
With Power 70
With Power 60
With Power 50
All 14 of the Dark Physical moves have 100% accuracy as well, so you'll never miss hitting your opponent.
There also 10 Non-Damage Dealing moves that affect the foe's status, but will not lower their HP.
darkri
the strongest electric type move is volt tackle
it is either overheat or blastburn
If you include hms, and mean all around strongest, use surf.
Air Slash
Torterra is the strongest Grass Pokemon in Diamona and Pearl.
Foul Play: Base Power 95Learned by:MurkrowHoundourHoundoomSableyeHonchkrowSandileKrokorokKrookodileZoruaZoroarkLearned (by breeding) by:MeowthPersianSeedotNuzleafShiftryKecleonStunkySkuntankPurrloinLiepard
The strongest Dark type move in terms of potential power is Punishment at 200 power though has a very big draw back to reach that power. The strongest Ghost type move is Shadow Force at 120 power. The Strongest Bug type move is Mega Horn at 120 power. Psychic and Dark Type Pokemon are indeed weak to Bug type moves.
Darkrai?
Pidgeot is a Flying type and the strongest Flying type move it can learn is Sky Attack.
earthquake
The move is Doom Desire
the strongest electric type move is volt tackle
Hydro Cannon
grass knot
dragon or grass
Blast Burn
Draco Meteor