To befriend Celebi, you can do it one of two ways..
Good luck. :D
When you find the Bouquet in the Flower Zone behind the Driftblim stop, give it to Bellossom and she will be your friend.
In PokePark Wii: Pikachu's Adventure, Pikachu can befriend various Pokémon throughout the game. The friend list features popular characters such as Charmander, Bulbasaur, and Squirtle, along with others like Snorlax, Mew, and Gardevoir. Each Pokémon has its own unique abilities and challenges, and befriending them often involves completing specific tasks or mini-games. The goal is to build a diverse team to help Pikachu navigate the different zones and overcome obstacles.
mocchi
Buneary
you can become its friend but you cannot use it sorry
you can earn shaymin in dusknoir's attraction in the mansion in the haunted zone. You have to earn the bonus for each Pokemon and you unlock him. Then he'll be ur friend when u get his bonus done
it is Emolga she is a cute bat pokemon its true
Get all the bonuses in Tangrowth's Swing Along.
You have to beat gyrados's aqua dash with every character exept manaphy then beat her with pikachu and she will be your friend
You get him by getting all the bonuses for empolions attraction
you have to do what they say so read the questions there talking about
beat the game and, sooner or later your friend list will be done!