Sorry to disapoint you but there is not one
finish the WHOLE game.
In PokePark Wii: Pikachu's Adventure, to obtain the secret codes in the Granite Zone, you need to interact with specific characters that provide hints or tasks. Completing these tasks often involves mini-games or challenges. Once you successfully complete them, you can unlock the secret codes that grant access to special features or items. Be sure to explore the area thoroughly and talk to all characters to find these opportunities.
the code is 46308926
there is no password. you have to get all the bonuses on bastiodon atraction.
Talk to everyone in the Granite Zone. If I remember, the words were Hope, Love, and Peace? Something like that. Good luck.
They all should be in that zone.
Open all the bonus boxes in venasaurs attraction.
You get him by getting all the bonuses for empolions attraction
There is no password. In order to get Deoxys, you must pass all bonuses with all playable Pokemon in Rayquazas Balloon Panic.
Pokepark wii is only one player because it would be dificult to play 2 player. this is all i know but its easier to play one player. i know that when you get to salamence's atraction get all the bonus' and latios will apear.
there is no code, but you have to clear Empoleons snow slide with all the pokemon ! ;')
beat the game and, sooner or later your friend list will be done!