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"Gravekeeper's Assailant" changes Attack Position to Defense Position or vice-versa. It cannot flip a monster face-down because that is not a change of battle position.
This effect targets 1 face-up monster your opponent controls.
You make the change of battle position due to "Gravekeeper's Assailant" at the beginning of the attack, so you can change the battle position even if the attack is then negated by "Magic Cylinder", etc.
(1) If Necrovalley is on the field when this card declares an attack, you can change the battle position of 1 face-up monster your opponent controls.
If "Imperial Order" and "Necrovalley" are both in play, "Necrovalley" is still on the field so you can still activate the effect of "Gravekeeper's Assailant".
The (1) optional Trigger Effect activates in Start of the Battle Phase – Attack Declaration.
The effect of "Gravekeeper's Assailant" targets 1 monster.
If the target is no longer face-up, its battle position is not changed.
If "Gravekeeper's Assailant" attacks, and activates its effect to change the battle position of the opponent's "Spirit Reaper", then "Spirit Reaper" is destroyed by its own effect. Then a replay occurs because the potential attack targets on the opponent's side of the field were changed. In this case, "Gravekeeper's Assailant" can attack again, and can activate its effect again.
The target can only be changed to face-up Defense Position. This effect does not Set the target.
If "Necrovalley" is on the field, an attack is declared with "Gravekeeper's Assailant", and the effect of "Gravekeeper's Assailant" is activated, and "Mystical Space Typhoon" is chained to the effect to destroy "Necrovalley", the effect of "Gravekeeper's Assailant" is still applied because "Necrovalley" only had to be on the field to activate the effect.
This effect can be activated even if Necrovalley's effects are negated by Magic Deflector.
Necrovalley only needs to be face-up when this effect activates, not when it resolves.
VS. Spirit Reaper: When targeted by Assailant, Spirit Reaper is destroyed by its own effect. Then a replay occurs, as the number of attack targets changed before entering the Damage Step. In this case, Gravekeeper’s Assailant can attack again, and can activate its effect again.
If "Gravekeeper's Assailant" attacks, and activates its effect to change the battle position of the opponent's "Spirit Reaper", then "Spirit Reaper" is destroyed by its own effect. Then a replay occurs because the potential attack targets on the opponent's side of the field were changed. In this case, "Gravekeeper's Assailant" can attack again, "but it cannot activate" its effect again.