Found this in my draw a minute ago, It originally came with an Issue of ONM.
Poster is a bit a creased etc from being a draw getting knocked about but it doesn't look too bad, could probably be ironed or something.
I'm guessing its around about A1 size and can confirm that it is designed to be positioned landscape.
On one side is a picture of Mario and Zelda fighting each other ( + 2 other characters above them) and the other side is a Character Profile diagram with profiles of all the characters in SSB.
I am looking for about £2.50 delivered or may be interested in swapping for a GAME Gift Card as I am saving up to buy some pre-owned GH:WT drums from there for a decent price.