Something I've decided to try to do is see how high in stats I can get my beetles. However, new beetles come out fairly often, and because you can only breed the same species together, I have to choose between being stuck with old beetle types with higher stats and giving up that progress to play with new and interesting beetles.

I suggest an item - possibly an event one - that allows you to merge two beetles: keep the stats and age from one and put it on the species and color of the other. That way, we don't have to lose stat progress when something new and shiny comes out.