That's a random O IV.
It happens.
The one time you may want a 0 IV is if you were planning a trick room team. Then you would want the 0 in speed.
If you read the suggested move sets on Smogon every once is awhile someone will say have a 0 in attack so the Pokemon doesn't hurt itself as much if it gets confused or the opposition uses Swagger.
You aren't doing anything wrong.
Just keep looking for the