>>56409875It's a Pokemon Essentials fangame with 485 Pokemon where you can fuse any 2 together.
The picture in the OP Pallosand and Gardevoir.
This is Wigglytuff and Mr. Mime.
It has all of Kanto with all of Johto, the Sevii Islands, and some extras as postgame.
The download is line 5 in the OP.