If you are very interested in Pokémon under the Amorphous (then Indeterminate) Egg Group, this is a club for you to join! You can just join for the sake of showing that you are a fan of this type of Pokémon, or you can join because you love them!
Basically, these Pokémon are compatible with each other when it comes to breeding, with the obvious exception of Rotom (because Rotom's genderless). Some of the Pokémon that belongs to this group are Gardevoir, Stunfisk and Gengar! This is just a small picking of the strange Pokémon in this group.
If you want to know a list of Amorphous Pokémon, look in the appropriate thread ("List of Amorphous Pokémon").
Thanks for reading.