Actually most of the comic relief your talking about when referring to Rowlet, is going by the poke dex entries something that all Rowlets do, and as for the whole thing with Steenee, keep in mind that it's clearly been shown that Sweet Scent does attract other pokemon, so it's not that unusual for one pokemon like Rowlet for example to attack Steenee when Sweet Scent goes off, also another thing in regards to people trying to say that Piplup/Oshawott/Chespin of this generation is that unlike them Rowlet is not really stealing or hogging any attention and the whole Steenee thing doesn't happen every single episode,
for instance we've only seen that Rowlet attack Steenee/Bounsweet in 3 out of 22 episodes, so when you really stop and think about it that gag hasn't been used a lot, nor does Rowlet being comic relief really happen in every single episode where as if you look at Piplup/Oshawott/Chespin them being comedic relief happened a lot more often. Also another thing to consider is the fact that even if Rowlet is used for comic relief that wouldn't stop it from evolving all the way to Decidueye because if you read the Rowlet's line's dex entries you would know that they each have a quirk about them that can be used for comic relief./QUOTE]
I'm not saying I think Rowlet is there yet, but he could head that way if they do keep persue the comic relief with him. Let's be fair, Piplup wasn't fighting for screen attention at first, I'd say it took a while for Piplup to fill the role, I think we saw glimmers of comic relief from time to time, like in its first episode, then again when it tried mastering Bubblebeam, then after that, as it gradually appeared more, it started becoming the comic relief, the thing that separates Piplup from Oshawott and Chespin, is that, it was actually serious at times, and shown to be competent. Whereas Oshawott and Chespin from the start were comic reliefs, Oshawott showed it right away when trying to get Trip's attention, then being absolutely gutted when it wasn't selected, and it was shown as the comic relief right away, same with Chespin and its food stealing in its first episode.
Which is why, I could see Rowlet going down the road, in a similar manner to Piplup, the writers may see how the response of Rowlet when its being the comic relief and then decide, if its working, then to go for it. Rowlet, like Piplup, showed glimmers of comic relief in its first episode, Piplup did it by fighting with Chimchar, whilst Rowlet did it by bringing the bell chime to the nest thinking it was food, trying to attack Bounsweet over and over again.
Its got time to develop into the comic relief like Piplup did, but like I said in my first post, considering Decidueye's popularity, it would be silly to not jump at the opportunity to evolve it. True that it has quirks which could be used as a comic relief, but how many pokemon evolve, and are still used as a promotable comic relief?