Dharma

Dharma (ダーマ) is a virus from Mega Man Battle Network 4 and Rockman.EXE 4.5 Real Operation. It shoots hockey pucks across the field. The pucks bounce off in a manner that can be difficult to predict. It will pause before it launches hockey pucks. Higher level variants can lay mines on the target's side of the field.

Dharma
Dharma is a red variant.

DharmaEX
DharmaEX is a green variant.

Karma
Karma (ダーガ) is a yellow variant.

KarmaEX
KarmaEX is a purple variant.

Dogma
Dogma (ダーダラ) is a blue variant.

DogmaEX
Dogma  is a black variant.

Battle Chips
Air Hockey (エアホッケー), shortened as AirHoc in-game, is the Battle Chip family from the Dharma viruses. The user launches a large hockey puck that moves diagonally, reflecting on the sides of the opponent area many times before disappearing. It can break through any obstacles and hits multiple times, but it will fall on holes present in the field.

As it only moves diagonally, depending of the user's position and considering the Panels weren't changed, it will either move in three diagonal panels (from top left to bottom right or top right to bottom left) or circle four panels from the area.

Combining three Air Hockey Battle Chips with their codes in alphabetical order results in the Program Advance Pit Hockey, a faster and stronger Air Hockey that lasts longer.

Trivia

 * Dharma appears to be based on the game Darumasan ga Koronda.
 * Outside Japan, Dharma and its variations are named after the principles dharma, karma and dogma.