While most players of R/S/E seem to have preferred Anopth (Anorith), I preferred Lilyla (Lileep), so naturally the Root Fossil was my favorite. I didn't like that we could only attain one of each Fossil in Ruby and Sapphire, however.
In Emerald you could get the Fossil you didn't choose after you defeated the Champion, however. It's really late in the game though, I think after you defeat Steven in that cave near Dewford Town.
raichu27 said:Root Fossil, because of its unique typing.