Wily Capsule

Wily Capsule (ワイリーカプセル) is the teleporting saucer that Dr. Wily rides and uses for combat after the destruction of his Wily Machine. First appearing in Mega Man 4, it is the final form of Wily in said game and onward, which torments Mega Man for the rest of the classical series. It was at its strongest in Mega Man 7. In Mega Man 5 it's called "Wily Capsule II", in Mega Man 6 and 7 it's simply called "Wily Capsule", and in Mega Man 8 it's called "Wily Capsule Great" (ワイリーカプセルグレート).

Transport
Dr. Wily's spaceship transport doesn't has a official name, but is referred by fans as "Wily Capsule" and "Wily Saucer", and the latter name is more used to differ it from the machines used in boss fights. It first appeared in the first game with a red and yellow color, and the red color was changed to blue in Mega Man 2 to 7 and the Game Boy games. In Mega Man: Powered Up it's red and blue, and he uses it to kidnap the original "8" Robot Masters (including Time Man and Oil Man). He usually doesn't directly battle Mega Man using only the saucer, except for Mega Man IV (referred as Wily Capsule due to being a boss) and the ending of Mega Man V, but Wily attached it in most of his Wily Machines.

Mega Man 4

 * In Mega Man 4, the Wily Capsule remains hidden, and attacks Mega Man with four swirling laser balls.

Mega Man 5

 * In Mega Man 5, the Wily Capsule attacks much like in Mega Man 4, but it fades into sight before attacking Mega Man with four laser balls.

Mega Man 6

 * In this game, it did pretty much the same thing as the others. Dr. Wily would constantly appear and disappear from time-to-time to to shoot about four projectiles in every direction.

Mega Man 7

 * In Mega Man 7, the Wily Capsule disappears and reappears much like in Mega Man 5, but instead of fading in, it pulls off a "cloak" of sorts. It also attacks with 4 laser balls, but the laser balls have varying elements; ice, fire, and thunder. Also, the Wily Capsule might fire thunder balls that go across the floor.

Mega Man 8

 * It didn't do anything truly unique in this game. It was the exact same fighting pattern as all the others; Dr. Wily would make the capsule appear and disappear, and it would fire projectiles in all directions.

Mega Man & Bass

 * Just like all the others, this Wily machine would appear, disappear, and shoot projectiles in all directions. Not only that, but this one had the ability to shoot bombs, as well, which could be easily taken down by the Mega Buster and/or Bass Buster.

Mega Man 9

 * It did the same thing in this one as all the others; appear and disappear, and shoot projectiles in almost all directions. During one of its attacks, it's possible to avoid it by standing in between the projectiles that Dr. Wily fires.