besides mew its arceus
reshiram and kyrem
RAYQUAZA IS THE BEST or GROUDON or KYOGRE for Pokemon Emerald THE 3 LEGENDARY!
Darkrai is not a legendary Pokemon check in the Pokemon Ultimate Handbook and go on Darkrai and it doesn't say legendary under it's name.
It's kinda your opinion. For me it is Zekrom. (I own with Electric types.) (and Zekrom. XD)
The legendary forest Pokemon would most likely be Celebi. As well as being the time-travelling Pokemon, Celebi is also a protector of the forest - most notably Ilex Forest (in Pokemon Gold, Silver and Crystal). No other legendary Pokemon is linked to any forest in such a way, so Celebi would have to be it.
With the current event, Victini is the first you can get.
Rotom is a weird Pokemon. In the Ultimate handbook it says it is but in the updated version it says its not. I think it is though.
It is a rare pokemon, but it is not a legendary pokemon
Unknown is not a legendary Pokemon but it is considered rare. Legendary Pokemon are one of a kinds.
no lileep is not a legendary pokemon but it is an ancient pokemon
The legendary is palkia