This pokemon papercraft is Mega Gengar, a dual-type Grass/Poison Pokémon, based on the anime / game Pokemon, the paper model was created by LuIS for halloween. There is another version on the site: Mega Gengar Papercraft Ver.1; and also Pokemon Gengar Papercraft and Mini Gengar Free Papercraft available.
About this pokemon paper model:
Height: 15.0 cm / 5.9 in
Width: 22.7 cm / 8.9 in
Depth: 19.7 cm / 7.7 in
You can download this pokemon paper model template here: Pokemon - Mega Gengar Ver.2 Free Papercraft Download