It's a very good start, but I do have a couple of thoughts. First, since AP gain is shared between the player and their pets, it should probably go in it's own page when it's completed. Since AP gain was confusing at first but ultimately fairly simple, if maybe kind of random, it didn't really need one seperated from Leold's page before. There is probably enough for it now that it and Leold's AP shop could be migrated to a page of their own. That might effect a lot of people though, so it's worth some more discussion among people working on the wiki first.
The other thing is that while the content might be good, it might be hard for a person starting out to find when that info would be the most useful. Even I am still stumbling onto some fairly nice stuff that is buried in the wiki. So I am kind of worried about the page name, and where it might be linked from. It's worth noting that when I first started throwing Elona+ stuff on the wiki, I spelled it like that rather than a more searchable term. So that part won't show up at all.
It could also later use a gene engineering section, since while there is some basic info on the GE page, it doesn't actually tell you how to get the most out of using it on your pets to get them the highest stat boost. It's INCREDIBLY TEDIOUS to do, but some people might be interested anyway. I can possibly type something up if you want ideas later on.