eternal floette can be obtained by using sweet scent in flower forest during morning(from sunrise to midday). it is very rare form of floette so be prepared to sit around every moring spamming sweet scent.
Is eternal floette treated as a legendary pokemon so you cant edit its IVs with tokens? if anyone has any experience or knowledge about this, i would like to hear about it.
Edit.
Caught one and can happily confirm that you can edit its IV with tokens. You should also know that it will learn...