>>31499694>because Ash has everything he don'tThis is the contention here, when the fuck was this stated or even implied? This doesn't even make sense, because Ash isn't the only happy trainer with friends on the planet.
To assume that this is why Alan is interested in Ash specifically would mean that Ash would need to have something special about him. The only reason Alan even met Ash was because of Ash-Greninja, and Alan only got all heated up when he fought Greninja the second time ("can you feel their strength" etc).
But since Ash is below Alan's skill bracket, it has to mean its something other than simple raw power that piqued Alan's interest (that would need to be the case to be consistent with Alan being bored). In this case, the first reaction Alan had was surprise that Greninja could Mega without a stone.
But since Alan never had any issues getting along with Charizard, that's obviously not the angle they went for. Instead, Alan's tipping point was his inability to protect Manon and her Chespin, which is incompatible with him battling Ash because battling someone below his skill bracket isn't going to help him in that regard at all.
The writers wanted to have their cake and eat it too, so people like you would choose whichever justification you wanted after the fact. Ash is somehow strong enough to get Alan's interest, even though Alan's fought lots of stronger trainers. Ash being happy is somehow something Alan can be jealous of even though plenty of strong, happy trainers with friends are running around Kalos.
tl;dr version is this
>>31499268>it's clearly written in because they wanted to force a relationship between them, so Alain could be his rival 
