Go to the lighthouse and go up the lift. Talk to the guy with spiky hair. Hell leave. Go back to the gym. Flint will be gone.
Hope I helped.
Ps. I know a website that might give you answers, WWW.Pokemon.Marriland.co.uk
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Go to the Sunnyshore city lighthouse up on the elevator , and you will see Volkner !Talk to him and Flint will not be blocking your way!
you can buy it in veilstone
you teach a Pokemon that move or use a TM
the only Pokemon tat i know that lerns it is staravia
Ruin Maniac Cave