There's one in Route 19, behind the battle house. I dunno what else you're missing. Have you gotten the one GD in Victory Road that's in Regirock's cave?
Thanks for the answer! Now I've finally completed the whole story, and i'd call it a MASTERPIECE!! Spent over 40 hours and I enjoyed every single battle I had, all the jokes and easter eggs hidden in the game, and laughed too much walking around with the frozen suit lol.
Congratulations for the effort and thanks for publishing such a wonderful and funny game!
Hope I get to play more good games of yours in the future. haha
P.S.: There were some bugs in the game, but nevermind, I just needed to ignore them, as it doesn't affect the gameplay at all.