which episode does berry appear in？

Berry doesn't appear in the anime. She is only in a sequel of Tokyo mew mew mangá called Tokyo mew mew a la mode.

Berry does not make an appearance in the Tokyo Mew Mew anime. She first appears at the end of volume 7 in the manga, but not the anime.

Berry doesn't make an apperance in the animê series,she's only part of the mangá "Tokyo Mew Mew A La Mode"

None of them, she appears only in tokyo mew mew a la mode, the mangá 2-part sequel to tokyo mew mew.

Mew Berry doesn't appear in a episode, she appears in a sequel manga; the segundo season to Tokyo Mew Mew. A mangá is a book incase you don't know. The mangá is called Tokyo Mew Mew A La Mode. There are only 2 books of it so far. Sorry this may be a spoiler but Berry becomes the new leader of the Mew Mews because Ichigo goes to England with Masaya.