This is "Eco-chan", the mascot for an environmental community centre in Japan's Yamaguchi Prefecture. Let's not screw around, Eco-chan sure as snot looks like Pikachu.
Eco-chan is supposed to be some sort of woodland fairy, but it looks more like somebody in a green Pikachu costume. The character was first unveiled last fall (without mention of Nintendo or Game Freak), and cute characters like this are common for Japanese companies, public utilities, services — you name it.
But Eco-chan? More like Copycat-chan.