Here are the things that will be put down in your signature.

• Trainer cards
  

each trainer cards will have 6 pokemons. The pokemons registered thre must be the one you used.
If you have more that 6 pokemons you need to keep the rest in your PC.

Click here to make your own trainer cards

then put them in your signature

• PC Link
  

there will be a special category for the PC. It wil keep the information about your Pokemons(other that the 6 you bring) and also items you've got.