There is a "skip-by-hop" guide (it doesn't include all the steps...) in the guides section titled:

[SPOILERS] MP Breeding Guide

(Not linking directly so that someone doesn't click on it by accident.)

There are many approaches to solving all of the plants, this one just gives information about one way. It all really depends on which starter plants and seeds are available when you start the game. But for people who are truly stuck, reading this may help.