You don't, it's a standalone game.
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You need to download an emulator that supports wifi
You turn into super sonic at the last level by getting all chaos emeralds but you only use him for that level. On the orther side you can search in google for the gameshark code if you are using emulator its easy to apply if not u have to get gameshark in order to use it. In SA3, there are 10 chaos in all 7 zones.You need to get all chaos in each zone to get the key. If you get the key,there is a spring so you can get inside of the stage.You need to get 60 rings for your partner.Get the rings before time runs out. You need to unlock the 7chaos emeralds to get super sonic.
No you do not need wifi to use the gameboy emulator.
You can't. It's illegal to use any type of emulator if you do not own the console of the emulator..
You can't, sonic 2 XL is a fan hack of the 1992 genesis game Sonic the Hedgehog 2 where the rings are replaced with onion rings, and collecting them will cause sonic to become fat until he can't even move anymore. To play any version of sonic 2 on a genesis, you must get the actual cartridge. If you wish to play sonic 2 XL you must download it on a computer or use a emulator.