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Ideas thus far that I like:
Types: Steel/Bug, (most genuine glitch pokemon have random types)
Miravistel's Idea for names:
Gg-_QmnX$ is now M41ru5
Gg-_QmnX$+ is now M41ru5+
Jolly's idea for the name change:
Illegal Operation is now Tech. Error (Most coding doesn't allow for spaces)
And, while I'm at it, I might as well try and flesh out the entries...
M41ru5
D: First found in the PC box of a noted hacker, it is thought to survive entirely by corrupting data. (98 characters)
P: It is often responsible for broken text files, but has been known to infect audio files as well. (96 characters)

M41ru5+
D: It possesses the capacity to completely ravage an entire city's network in a matter of seconds. (95 characters)
P: It is a crime severely punishable in several regions to deposit this Pokémon into a PC box. (91 characters)
Thank you for the help so far. Now, onto the concept of appearance: Should these be closer to genuine system errors or insects?
Also, when should M41ru5 learn Tech. Error?

Well, I was thinking more along the lined of something that looked like a computer-generated image, on the grounds that M41ru5 and M41ru5 are based on malevolent software.

Cacapulse:
For M41ru5, perhaps, but I was thinking that M41ru5+ could be based on those 3-D CGI images that high-school CAD students always make.
On the matter of Illegal Operation:
It should be its own move. Perhaps I could shorten it to Illegal Op.?
Although I think that the accuracy proposition is good enough.
Illegal Op thus far:
Illegal Op.
Power:?
Accuracy: 80
PP: 5-10
30% chance of inflicting the user with a random status ailment.
Exploits a bug in coding,
with unpredictable effects.