Okay, so... You want to play Pokémon Colosseum & Pokémon XD: Gale of Darkness. But you don't own a GameCube, but you do own a Wii (I'm assuming from the desc.).
Keep in mind that in order to play GameCube games on a Wii you'll need a GameCube Memory Card, and Controller with (depends on your Wii) the appropriate USB type.
Note: Memory Cards can be as much as $30, while controllers can be as low as $20.
That said, here are your options:
Purchase a copy (store of choice). Though do note that (international copies) old games are (usually) expensive, and it's hard to tell if they're authentic/a scam or not.
● Though a Japanese copy of Colosseum can be around $20-50, XD is a little over $50. Buuuut you would need a Japanese Wii, which could be $25-50 or a little over $100 at most.
Setup a PC emulator to play the game(s).
Homebrew your Wii to play the game(s).
Due to Rule #0.8 I cannot provide any elaboration on the last two methods, self-research is required.
