These articles seem to be an ongoing issue. It's a slippery slope: Ash's Pikachu obviously deserves an article but Paul's Ninjask certainly doesn't. So the question is where do we draw the line? We need a solid answer.
Right now, the biggest issue is Paul's Magmar. It might deserve an individual article in the future but right now it has only appeared in a flashback - that's less than his Azumarill (now a redirect by consensus).
Ash's Raticate is also questionable.
My personal take on notability is whether you can say enough about the subject of the article to expand the information out of the trainer's article and/or the anime section of the species article. Otherwise, that's what those are there for.
But let's come to some agreement on this.