Mega Ampharos the Dragon
History Nerd
Although let's be honest, he acts more mature in XY and XYZMaybe yes, maybe not, we only know that Ash has not entered puberty, so it is normal that he does not know what he feels
His reaction to the kiss was too childish, but it's obvious that he liked it XD
Also, his age was never said in XY, so if you think about it, you can headcanon his age without ruining the real stuff