Ash thanked Pikachu because it was the one to make Team Rocket disappear with that electroballYay!!! Go Unfezant!!! Kick their wannabe asses <3!!!!
Also what the hell Ash, Unfezant does all the work and u thank Pikachu -_________________-.
But I agree, Unfezant made it happen, and helped immensely, so I was disappointed that Ash didn't thank Unfezant.
I kept thinking "Come on Ash, Unfezant did a hell of a lot more, the least you could do is acknowledge that."
Edit: Also I have to say Nonomi's Tepig was far cuter than Ash's Oshawott has ever been, and they just to market Oshawot.....right.