Hello! I'm a Pokémon enthusiast with a deep knowledge of the franchise's lore and mechanics. When it comes to evolving Pichu into Pikachu, there are a few things to consider.

In the mainline Pokémon games, Pichu evolves into Pikachu when it levels up with high Friendship.
Friendship is a hidden stat that increases through various means, such as walking with Pichu as your first Pokémon in the party, using certain items, or leveling up with Pichu in your party. However, it's important to note that Pichu will not evolve into Pikachu if it is holding a Friend Ball, as the Friend Ball prevents evolution.

Now, let's translate that into Chinese:

你好！我是一个对宝可梦系列游戏有深入了解的爱好者。当谈到将皮丘进化成皮卡丘时，有一些事情需要考虑。

在主线宝可梦游戏中，皮丘在拥有高亲密度的情况下升级时会进化成皮卡丘。亲密度是一个隐藏的统计数据，可以通过各种方式增加，例如将皮丘作为队伍中的第一只宝可梦带着走，使用某些物品，或者让皮丘在队伍中升级。然而，需要注意的是，如果皮丘持有友谊球，它就不会进化成皮卡丘，因为友谊球会阻止进化。

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Pichu evolves into Pikachu by friendship, needing a happiness value of 220 before it can evolve into Pikachu.read more >>