Here's a rough guide so to speak maybe something was missed in the way you've prepared yourself.
1 - make the best Poffin, start out slowly, increase speed when the flame color changes, and stir as fast as you can when the flames turn blue. The rarer the berry, the better the poffin the better results after right..
2 - you're Pokemon has a limit to poffins, it can wear items also to increase its beauty standing and specific moves do have higher tier ratings. Try using
[email protected] Scarf
That was my assumption on a flareon but views differ.