1. You must have 6 Pokemon. One Pokemon each must be a part of the following families (no duplicates):
Canine: Dogs, Skunks, Foxes, Mongoose
Feline: Cats (domestics like Glameow, or killers like Persian)
Amphibian: Frogs, Tadpoles, Turtles. Any Pokemon that lives NEAR and not IN water like Slowpoke, Lilleep, Oshawott, Piplup
Reptile: Snakes, Lizards, Dragons (Snivy, Arbok, Axew, etc.)
Equine: Horses, Deer, Cows, Bulls, Sheep, etc.
Mus Musculus: Mice, Rats, Chipmunks, Hedgehogs, Meerkats, etc.
Ichthyoids: Fish, Crabs
Swine: Pigs, Boars
Insects: Worms, Caterpillars, Butterflies, Moths, Flies
2. If any of your Pokemon fall prey to their mortal enemies (ex. Pikachu faints in a fight against Pidgey, Ekans, or Meowth), that family (in this case Mus Musculus) is automatically extinct. If they faint to other Pokemon, they have to die 3 more times before they're extinct.
3. If a Pokemon in a family is extinct, you may not use that family again.
4. You may breed a dying family (they must have fainted twice) and use the egg as a replacement. That egg must go by the same rules as 2. Trades must be in the same family as the dying Pokemon and must follow the same rules as 2.
5. You may not catch multiple Pokemon in your selected families. You may only have 2 (or a Ditto) for breeding and the second/Ditto can't be used as a replacement, only the egg can.
Banned: Any Pokemon made of inanimate objects, Any Pokemon made with technology, Rock types, Psychics, Grass Types that are Plants (Cottonee, Sunflora, Weepinbell), Humanshapes, Ghosts, Intermediates (only Ditto allowed for breeding).
I like it. Hell I might use it for some of the gba games I got in the mail. What I'd like though for the slow people like myself is a little chart that says 'this type is weak against this type' to use as reference for when a Pokemon faints