Yeah... that's weird in some case. In negative continuity series, technology time seems to flow, but characters doesn't grow. And another thing that identify those class of series are that their episodes are kind of autoconclusive and they aren't related to each other. Most of American cartoons and "comedy-slice of life" animes like Sazae-San, Doraemon & Crayon Shin Chan enter in this type of series.
Pokemon is an anime with positive continuity (Very much like Dragon Ball Z, Sailor Moon, Yu Yu Hakusho, Inazuma Eleven, Hokuto no Ken, etc), where each episode, aside from fillers, despite someones being stand-alone episodes, is kinda related to each other, specially gym battles, monster capture, minor tournaments, leagues and villanous plots and some episodes leaves consequences into the future. However time doesn't seem to flow, and that makes all that issue into continuity. So, the "non-growing" issue will affect, in some way, negatively into SpaghettiShipping (it's contagious the new name).
However there are also some very longrunning animes that had their timeskip too late into story. One Piece is an example. After about 500 episodes the time skip occurred. Hunter X Hunter is very likely to have one when the manga returns, given an important plot was accomplished (Gon has already met his dad, that was his lifetime goal, and this is the equivalent to Satoshi winning a league and beating the regional champion, but his journey is only beginning after that). So, if Satoshi wins Kalos League and wins against Karune too, that doesn't mean he's gonna be a Pokémon master. Hidaka Masamitsu's 2005 interview statement about Pokemon going to end when Satoshi wins Pokemon League was plainly debunked when Staff introduced champions league into Diamond & Pearl series. So, there's a chance to have a timeskip given the conditionals.
In that scenario, there's also a possibility Amour (or least likely other Sato Shippings) will go canon, if the conditions are the appropiate for that.