Fan made game!
There is no official website for infinite fusion. Be wary of any website that claims to be, or offers downloads.

The only official webpage for the project is the thread found on PokéCommunity.
https://www.pokecommunity.com/threads...

This game reintroduces the DNA Splicers from Black and White 2... Except this time, you can use it on EVERY Pokémon!
Use them to combine any two Pokémon together into a completely new Pokémon.
216,225 unique combinations exist in the game!