Newport County face the reigning Premier League champions Manchester City in the fifth round today after remarkable wins against Leicester and Middlesbrough.
Flynn took his Uefa Pro Licence alongside City's assistant manager Mikel Arteta and Thierry Henry and the two cup rivals have remained firm friends since.
The League Two side come into the game on the back of a 1-0 defeat against MK Dons, while Pep Guardiola's side completed a 6-0 demolition job against Chelsea.
Speaking to BBC Sport Wales, Flynn said: “There were a few things after the Chelsea game, I think they were trying to do a bit of scaremongering.
"We still have the WhatsApp group from the coaching course and we all bounce ideas off each other and share in each others' success.
"It's brilliant because there are people from all levels, whether it's bottom or top, and people out of work or in work.
"Everybody is respected in the same way and that's what our course was about – we can all learn from anybody."
Flynn, 38, previously revealed to Sunsport that he intends to use Guardiola’s own advice to turn Newport into the greatest FA Cup giant-killers ever.
He said: “Those of us on the course a couple of years ago were lucky enough to get a talk by Pep.
“We got a good hour out of him and what he said has resonated with me ever since. It was such a privilege to meet him and listen to him.
“What stood out for me, the biggest thing I took away from that day, was his utter belief in the way he does things. His philosophy means everything to him.
“He is such a man of principle and he will always, always stick to what he believes in whether things are going bad or not.
“That is the approach I will rely on against him and his City players.
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