>>53953137I mean that's what I say, it didn't look like a gimmick until Gamefreak couldn't be bothered to continue creating more.
It's a very anime-shonen thing, to scream and push past your limits to unlock a power-up.
I can't imagine Ash doing weird poses to shoot Z-Moves in the Mewtwo movie or just turning Heracross gigantic to squash Darkrai.
However it easily fit for him to go super saiyan and scream for Charizard to stand up when he's being defeated, evolving into MEGA Charizard to battle Entei or Gary's Blastoise. It fit the tone of what Pokemon was about.
>>53953143The XY anime actually proves how well integrated Megas were, it was the natural next-step for Pokemon, aiming for higher powerlevels and big shonen moments.
After that they soft-reboot the franchise to make it for toddlers.