The number of possible Pokémon fusions in the Infinite Fusion Generator is virtually infinite, as the tool allows for the fusion of any two Pokémon from the first seven generations of the franchise. With over 800 Pokémon in total and the ability to fuse any two of them, there are over 150,000 potential fusions that can be generated. However, it's important to note that not all fusions are viable or balanced for gameplay, so it's up to the player to use their judgment and select fusions that make sense and fit their gameplay style.