Do you want to know what a Solo Challenge is? Then read this. Basically, you have to complete any game by just using one Pokémon. This Pokémon can be anything but Stage 1 and Stage 2. If you cannot get the specific Pokémon you want, pick a random starter and wait until you can get it. You can only hack it if the Pokémon is not near to the start of the game.
1) Whenever a Pokemon faints, your challenge has ended. You have failed. Simple.
2) You may choose any Pokémon except Stage 1 and Stage 2 Pokémon. However you can evolve them.
3) Like the Nuzlocke Challenge, it's a good idea to name your Pokémon. However this is optional, so don't worry if you don't want to nickname your Pokémon.
4) No catching Pokémon. This is again optional, as if you see a shiny Pokémon for example, you might want to catch it. You may catch it, but you have to put it in the last box in your PC or trade/migrate it to another game.
I'll play too, and post updates regularly. I'll be doing Emerald. With a Pichu!
You may do these things on this Challenge:
Going to the Mart
Catch Legendaries (Have to put them in PC)