alot of the are for 220 or greater, that is any Pokemon that evolves through happiness, source: http://www.psypokes.com/lab/happiness.php
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it will need about 100 happiness
Its happiness value need to be at 220 in the Day Time.
220 or more, it should show 2 hearts on the friendship checker.
Pichu's FriendshipIf you have Pearl, Diamond, or Platinum, then check how much Pichu likes you using the 6th app. of your Poketch while having your Pichu in your party. If it has two big hearts above its head, then it will evolve as soon as you level it up, unless if you do something to lower its Friendship, liking giving it Herbs or letting it faint. In Ruby, Sapphire, Emerald, FireRed, or LeafGreen, you can't tell how much Pichu likes you, so you'll just have to keep on traveling and leveling it up. To make the whole thing easier, let Pichu hold a Soothe Bell as you travel and give it Pokeblocks or Poffins of its favorite flavor.
most people say 100 happiness so if you want to evolve it from an egg it should have about 70 happiness so give it proteins irons etc. and give it a soothe bell and battle. p.s. don't let it lose