Alright. Since I've never really said anything other than I'm an Advancedshipper, I suppose I'll explain myself.
View on Pokeshipping. Throughout the original series, every time it seemed that Misty may have something for Ash, he simply was just like, "lolwutt?" Now, while this is in part due to the fact that he was not nearly as mature as he is now, it was also made a point that neither Brock and Ash really found Misty attractive. She never got those, "Wow (name) you look great!" type statements that May and Dawn both have gotten. I think Ash still had a more "best friends" type thing the more recent times she appeared. I'm sure Misty was probably meant to have a crush on him towards the end of original series, but Ash just didn't seem to have the same interest. After awhile, I'm pretty sure Misty just sort of let it go. That, and a lot of Pokeshippers (not all, don't get offended :P) seem like those people who are all like, "every Pokemon after 150 sucks because that's all I played/watched growing up." So, yeah.
View on Pearlshipping: My view on this is sort of similar to Pokeshipping. Throughout DP, Ash and Dawn both seemed to just have that best friend mentality. You know, all the high fiving, etc. When Lyra asked Dawn how she felt out Ash, she legitimately had a surprised feeling if you ask me, and the embarrassment/blushing was only brought on because nobody had ever asked her a question like that, not because she had feelings for Ash in particular. Ash and Dawn are extremely close, but only in the friends/do your best type thing. Ash crying over Dawn's contest mishaps seemed like he was more generally upset she hadn't one than because he was sad the girl he liked lost. Moreover, they were just seemed like friends, once again, with neither side really ever thinking about a romantic interest.
View on Advancedshipping: I favor advanceshipping over the other two main ones, not because it's perfect and the other two suck, but it seems the least flawed of the three. Both Ash and May seemed to have the same care for each other that Ash did with Misty and Dawn, but it seems to me that it existed slightly beyond the level of care for her as a Pokemon trainer. May really looked up to Ash as well as admiring him, and seemed to really look to him as a guide for things beyond Pokemon. Ash also seemed to have a protective side that May often used, even when she did become stronger and more confident. Neither Misty or Dawn really had that type of protective relationship with Ash.
Anyways, that's just why I pick what I do. Of course, none of the shippings will ever be confirmed and this is all just pointless speculation, but it's fun nonetheless. :P Those three main ones are the only ones I'm relatively interested in though. All the minor ones are meh.