Wifi is the best way.
N.B. it's recommended to download the sd files using you wifi connexion (install the game and launch it without copying the sd files then it will download the sd files automatically (around 120MB), wifi is required, if you don't have wifi then just follow the following steps)
How To use:1- Download & Extract the rar files containing Pes2012.apk & sd files
2- Copy the PES2012.apk to your sd card & install the game
3- Then copy the sd files: "com.konami.pes2012" folder in your sd-card/Android/data/... directory
And now launch you game and enjoy the amazing football game on you device