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Mettaur (メットール,Mettōru) is a common virus type in the Mega Man Battle Network series, and the only species to have a constant appearance, while other viruses were replaced or omitted. They wear small hard hats with crosses on them and wield a pick axe, which causes a shock wave when thrust into the ground. In the games, they move up and down the columns they are in, sending shockwaves at the player. While normal Mettaurs stand still while the other Mettaurs present attack, stronger variants hide in their helmets and are impervious to attacks (unless they come out of their helmet or are attacked by an attack that can pierce). In Mega Man Battle Network 3, a family of Mettaurs can be caught and brought to the Virus Breeder, where a special Battle Chip can be obtained from them; upon meeting certain conditions, the omega version can also be caught.
The Battle Chips Shock Wave (ショックウェーブ,Shock Wave also written as Shockwave), Sonic Wave (ソニックウェーブ,Sonic Wave), Dyna Wave (ダイナウェーブ,Dyna Wave), are a non-elemental attack where the user swings a pick to send a shockwave forward. The shockwave can pierce some defenses, but as it moves in the ground, hole panels will stop them.
Big Wave, known as Great Wave (グレートウェーブ,Great Wave) in Japan, is a stronger version that cracks the panels it passes by. It only appears in Mega Man Battle Network 3, being obtained from Mettaur3 if MegaMan has Custom Style.
Met Guard (メットガード,Metto Gādo), also known as Guard, is a Battle Chip that repels an enemy's attack as a shockwave attack, unless attacked by the enemy's body. For example, Guard cannot block Fishy's and Powie's attacks, as they directly hit the player rather than firing a projectile. In the first game there is a Battle Chip named Buster Guard (バスターガード,Buster Guard) that allows the user to use Met Guard several times for 1 turn.
Met Guard chips are replaced by the Reflector (リフレクメット,RifurekuMetto, roughly "ReflecMet" in Japan) family in the sixth game. It acts the same way, but instead of shockwaves, it releases a fast chain of explosions that aren't stopped by holes.
Mega Man Battle Network
ID
Battle Chip
Description
Attack
Element
Codes
Rarity
023
ShokWave
Piercing ground wave
60
None
C,K,L,N,P
*
024
SoniWave
Piercing ground wave
80
None
C,D,J,M,S
**
025
DynaWave
Piercing ground wave
100
None
C,E,M,R,S
***
067
MetGuard
Hold A Btn for 3 sec defense!
-
None
A,C,E,G,L
*
107
BstrGard
1-turn of MetGuard w/ B Btn.
-
None
A
***
Mega Man Network Transmission
ID
Battle Chip
Description
Attack
Element
Size
Rarity
041
ShockWav
Smashes blocks with pickax for a shockwav attack!
40
None
8 MB
*
042
SonicWav
Smashes blocks with pickax for a shockwav attack!
70
None
043
DynaWav
Smashes blocks with pickax for a shockwav attack!
100
None
090
Guard
Can be used to convert attacks into shockwaves
-
None
16 MB
*
Mega Man Battle Network 2
ID
Battle Chip
Description
Attack
Element
Codes
Size
Rarity
040
Shockwav
Shock goes through enemies
40
None
H,J,L,R,U
10 MB
*
041
Sonicwav
Shock goes through enemies
60
None
E,I,M,S,W
30 MB
**
042
Dynawave
Shock goes through enemies
90
None
G,N,Q,T,V
50 MB
***
114
Guard
Repel the enemy's attack
-
None
*
2 MB
*
Mega Man Battle Network 3
ID
Battle Chip
Description
Attack
Element
Codes
Size
Rarity
Standard Chip 044
ShockWav
Shock through enemies
60
None
D,H,J,L,R
10 MB
*
Standard Chip 045
SonicWav
Shock through enemies
80
None
G,I,M,S,W
26 MB
**
Standard Chip 046
DynaWave
Shock through enemies
100
None
E,N,Q,T,V
42 MB
***
Standard Chip 047
BigWave
Shock through enemies
190
None
E,J,M,P,Y
82 MB
****
Standard Chip 133
Guard
Repels enemy's attack
-
None
*
5 MB
*
Standard Chip 174
Mettaur
Summons a Mettaur to fight!
????
None
L,T
30 MB
*****
Mega Man Battle Chip Challenge
ID
Battle Chip
HP
AP
MB
Element
Acc
Dodge
Priority
Attack
Description
Rarity
040
Shockwav
120
50
10
None
B
?
?
Pierce50
Pierce Guard Navichip Attack
*
041
Sonicwav
120
70
20
None
B
?
?
Pierce70
Pierce Guard Navichip Attack
**
042
Dynawave
120
130
40
None
B
?
?
Pierce130
Pierce Guard Navichip Attack
***
114
Guard
10
40
20
None
B
?
?
Reflec40
Reflect Non-Elem Attack
**
Mega Man Battle Network 4
ID
Battle Chip
Description
Attack
Element
Codes
Size
Rarity
Standard Chip 103
Guard1
Repels enemy's attack
50
None
A,L,V,*
4 MB
*
Standard Chip 104
Guard2
Repels enemy's attack
80
None
C,G,P,*
10 MB
**
Standard Chip 105
Guard3
Repels enemy's attack
110
None
F,R,T,*
16 MB
***
Rockman.EXE 4.5 Real Operation
ID
Battle Chip
Description translation
Attack
Element
Size
Rarity
Standard Chip 103
Met Guard 1
By timing guard, repel an attack with a shock wave!
50
None
4 MB
*
Standard Chip 104
Met Guard 2
By timing guard, repel an attack with a shock wave!
80
None
10 MB
**
Standard Chip 105
Met Guard 3
By timing guard, repel an attack with a shock wave!
A Mettaur with an arrow on his helmet leaves the Undernet to ask for help, and when GateMan.EXE takes him back, he accidentally takes MegaMan with him. MegaMan discovers that Mettaurs are under attack and helps them.