Ralts wants to be a Gallade when she grows up because she looks up to his dad but the problem is she can't, so her dad is explaining why she can be a cool-looking gardevoir instead :D
gallade: i’ll teach you a cool move you can use when u grow up ralts: okay gallade: *shows cool move* ralts: cool!.. idk if i can do that… gallade: its okay i can show u again ralts: yay!