Leafeon is an Eeveelution that debuted in Gen 4. However, the Spaceworld '97 Prototype of Gold and Silver has a Grass-type Eeveelution called リーフィ, (Riifi), that was scrapped from the final game. Leafeon's final Japanese name is リーフィア (Riifia). Interestingly, in the data of Pokemon Battle Revolution, filenames for Sinnoh Pokemon cries use early romanized versions of Sinnoh Pokemon names. In this data, the filename for Leafeon's cry is its Spaceworld '97 name, Riifi.
https://tcrf.net/Pok%C3%A9mon_Battle_Revolution#Early_Pok.C3.A9mon_NamesAlso within this data are some of the early names that were also seen in the recent DP source code leaks, such as Giratina's early name.
