My friend placed Flareon and Ditto on the Day care.
The Flareon had Fire Blast, The Ditto had Transform. ofc they got an egg. when the egg hatched the Eevee had Fire Blast. according to Showdown / This site / Many more sites. Eevee cant learn Fire Blast
Cuz it would be awesome to have a Leafeon with Chlorophyll and Fire Blast used in a Sun team.
and I'm 100% sure that My friend havent hacked.
This was Gen IV PKMN soulsilver. Glitch?