Pharaoh Wave

Pharaoh Wave (ファラオウェーブ) is Pharaoh Man's Special Weapon in Mega Man 2: The Power Fighters.

Mega Man 4
While Pharaoh Wave isn't mentioned in the game by name, one of Pharaoh Man's attacks is similar to this weapon, presumably being the same, the only difference being that it fires one energy wave straight forward instead of two waves. However, Mega Man can't obtain it from him, obtaining Pharaoh Shot instead.

Mega Man 8
Pharaoh Man is seen using his wave attack from Mega Man 4 in the opening scene.

Mega Man 2: The Power Fighters
Pharaoh Wave replaces Pharaoh Shot as the weapon obtained by the player in Mega Man 2: The Power Fighters. It is obtained by the player that takes the Special Weapon Item after defeating Pharaoh Man in the "Recover the new parts!" course. When used by Pharaoh Man and the playable characters, it releases two waves, one forward and one backwards. Also, when Pharaoh Man's giant eye is hit, he counters by releasing one wave from the eye. Pharaoh Wave is Gemini Man's weakness, and can hit the two Gemini Men at the same time.