So I just saw that whole kiss scene and well yeah, here's my thoughts overall and my thoughts overall on this whole shipping thing. I do not care for shipping and I usually don't care which character get's with who at the end, my problem is not the shipping itself but the shippers because some of the shippers just take things way too far and they act immature and mock other shippers and if the pairings they wanted to see doesn't happen then they go crazy, it's ok to be angry and even a bit upset but damn don't go overboard seriously at the end of the day these characters are all fictional's they do not exist. Not saying all shippers acts like this but I've seen those that do. Also try not to mock other shippers doing that just basically makes you completely immature, respect other people's opinions especially when it comes to this whole pairings.
Now as for the shipping in Pokemon I just personally find it weird, mainly because the characters are children and seeing people pair these kids with each other is just weird for me, but hey if you like to pair two kids with each other then alright. Although I can maybe understand pairing them with each other for maybe in the future when they get older.....lol Ash will never age.
Now this whole thing with Serena I like Serena's character have no problem with her character and she was very enjoyable to watch and her whole Pokemon Performances were also enjoyable to watch, now seeing that whole kiss scene, it was cute but that's basically it. Now whether she kissed Ash on the cheek or on the lips all I can say is just use your imagination, if you think she kissed him on the cheeks then she kissed him on the cheeks or if you think she kissed him on the lips then she kissed him on the lips, now as for Ash say what you want but to me it was pretty obvious that Ash felt nothing he's oblivious to love, his reaction was basically "huh I got kissed ok bye Serena." And honestly I think Ash is going to forget all about that kiss just like how he forgot about Pidgeot. Right now the only thing Ash cares for is Pokemon battles he could care less for romantic stuff heck he's 10 years old, he's not going to think about romance, or anything like that at that age. So yeah these are just my overall thoughts.