Well, the Notched Ear Pichu has received a new name! The name is now Spikey Ear Pichu

Serebii
The offical site has included an advert hinting at the Notched Ear Pichu's existance. However, the file name for that advert appears to show the US name for the Notched Ear Pichu. According to the advert, it is known as the Spikey Ear Pichu. This name is tentative so may change prior to release. This is a special Pichu that appears in the upcoming movie as well as being obtainable in the new games HeartGold and SoulSilver event.


Well, in other news another returning aspect from Gold and Silver, you have the ability to headbutt for a new way to find Pokemon.

Serebii
Another returning aspect from Gold and Silver, you have the ability to to headbutt trees for a new way to find Pokemon. Many Pokeon found in these trees are exclusive to them.


Well there is a whole page detailing various information on headbuttable trees. To see that page, please click Here