Hello,
I want to say some thoughts about Pearlshipping.
First of all, no need to worry of Pearlshipping even now since Ash and Dawn are already long ago Pokemon-married. Indeed, the Buizel - Aipom trade was like a wedding rings exchange, even better, since Buizel could remind Ash of Dawn. There were even witnesses, Ash's best male friend Brock and Dawn's best female friend Zoey. And before it Ash and Dawn really gaze into each others' eyes like two people being subconsiously in love.
Secondly, the Doc Brock & Gible episodes make sure their Pokemon treated Ash and Dawn like their parents. Besides, the Poffins & Happiny Family episodes really made them look like compatible parents, with Ash washing the dishes and Dawn drying them, with both of them doing household activities.
Thirdly, true love is the highest level of concern which is expressed by doing something caring that one does not expect. Dawn once came to help Ash at night (sic!), possibly being asleep before. Ash once invited Dawn to participate in the tag competition to help her in coping with loss depression. Ash many times showed concern for her and vice versa. Personally, I would not depict him as dense, I would depict him as inexperienced. You might love a person not knowing it is love.
Fourthly, we all know that love is almost always purely accidental. Could Dawn once think she would accidentally try to catch Ash as a pokemon? Gotta Ketchum (catch him) all! By the way, Pachirisu could be named as an indirect 'Pearlshipper' since it many times stroke Ash but he did not complain to Dawn for it as Piplup did for Gible's assaults.
Fifthly, Delia is acquainted with Dawn. Johanna became acquainted with Ash even earlier. Could anyone predict that 'dense' Ash would talk with Dawn's mom after her contest loss? Besides, both mothers are also acquainted.
So, you see, this pearlshipping puzzle is almost complete. No need to worry, whatever female protagonist is now.