the lil legendary is the pokemon generally near the end of that gen's dex with base 100 stats across the board..... both manaphy and sheimi have that as well as mew/celebi/jirachi...... thus the people wondering.if your talking about the Mew/Celebi/Jirachi of the 4th gen, Manaphy is.
Sheimi is a event pokemon like Lugia and Ho-oh, except smaller.
Fione isnt a pre evoI think Sheimi? Manaphy has a pre-evolution (correct me if I'm wrong), so it's not serious that's he/she is the new little legendary
No it was given so that people who cant get Manaphy can have a taste of it. It came from a special egg, so they could have gone with the logic that breeding it with ditto wont produce that egg, after all, all legendary Pokemon have Hatch steps, but they also probably created Fione so that little children dont go "Well if it came from an egg shouldnt I be allowed to make more of it?"Both of them are, Manaphy was given Fione so people wouldn't produce more Manaphys.