Bots and pet battles.

[Luciandk]

Bigglesworth was glitched a while back. It would keep spawning new ones in your pet book.

[Ravnhawk]

I got 3 of Mr. Bigglesworth when I got the achievement. I just haven't deleted the extras yet. Not sure if I will.

[Tahsfenz]

Same, got 3 from my achievement. I just can't bring myself to remove the extras.

[Awq]

they always follow the same extremely weird pattern:
-wait half a minute, then pick one of the 3 anubs
-inmediately swap for another one no matter what you do (!)

And they swap a lot.

Did they always use Crush? Ive encountered the same Anubisath team around 8 times. They displayed the same unusual behavior in every match.

They used Demolish rather than Crush. It might not be the same program.

[Syrrie]

3x Mr.Bigglesworth(is that even possible? its a unique pet from achivement right?)

The achievement was kind of buggy when it was introduced and many people were rewarded with 3 Mr. Bigglesworths, even though they're unique now. (It'd also keep filling up your three slots with Bigglesworths, even if you deleted one or two of them.) It seems that when they fixed the achievement to not keep rewarding you with extras they didn't remove the extra ones people had. You can check my collection to see an example of this, as I never had the heart to get rid of my extras and ended up levelling all three to 25.

[Invictus]

Did they always use Crush? Ive encountered the same Anubisath team around 8 times. They displayed the same unusual behavior in every match.

They used Demolish rather than Crush. It might not be the same program.

They use demolish sometimes. The bot is programmed to use 3, 2, then spam 1.... so they can swap out crush for demolish if they want and the rest of the mechanics will be exactly the same.