>>50906659No, it's just that this Breloom is one of the few original characters in the hack and compared to the other ones he gets a lot of screentime, a whole backstory involving him being on bad terms with the Wigglytuff guild, and even character development scenes. He also goes with the protagonist & partner to some dungeons and is involved in some main plot stuff.
The way the story pushes him combined with him being in the "boxart" really tells that the writer likes the Pokémon, but to me he didn't come out as a "muh super special OC donut steel self-insert" or anything like that so I don't consider it as a negative point of the story. At most I would say it has one or two too many cases of "Hey we should invite Breloom to help us in this dungeon".