How did Barry create Gideon?

It may be that the Barry of the future designed Gideon because he too no longer had the Speed Force and had to make an artificial one. What he came up with may have been Gideon. If Gideon is indeed Barry’s artificial Speed Force, that would make sense of why built her, and why she knows so much about the Speed Force.

When was Gideon created?

Gideon (comics)