Cross Pollinating Plants?

What is the best way to cross pollinate roses? Also can any two plans be cross pollinated to create a hybrid or only two plants of the same species. For example can you cross polinate Rose-Hibiscus or just Rose-Rose?
Cross Pollinating Plants?
species form when groups of plants become unable to breed with one another. that's the definition of species. It is however, more loosely applied with plants. Some species, generally those not distantly separated by evolution, can cross-breed. Most however cannot. Each example is individual. It's about SEXUAL COMPATIBILITY; whether the pollen and the egg are compatible enough to make a new plant. As a rule of thumb, the more similar two plant species seem, the more genetically related they are and the more chance there is of a successful coupling taking place. Hibiscus and Roses are in entirely different plant families, very distantly related and therefore almost certain not to be compatible.
Reply:When pollen grains are transfered from the anthers of one flower to the stigma of another flower,it is called cross-pollination or allogamy.
Reply:The best way to cross pollinate roses is to take pollen from one rose and put it in the pistma of the other type of rose. I don`t know about mixing two different plants, but mixing same species like roses probably would work. If you want to know for sure do experiments.