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Pokemon is a long running kids anime where characters never grows up. Therefore it is hard introduce canon romance since the character can not enter a real relationship, not to mention irrelevant. There are only two way to introduce canon shipping in pokemon anime.
A) Reveal Ash's endgame at the final pokemon series where Ash achieve his goal and move on.
B ) Introduce a girl that has a close friendship with Ash and appeared in almost all series. The anime simply focus on deepening their friendship while making romantic moment that doesn't break their status quo (The pic). Until the series reach its climax where Ash and the girl friendship start to chance into love which they start to acknowledge.