>>12564593Flare Blitz Flareon would still be bad. Its speed is way too low, and if you wanted to use a toxic orb with Guts you'd just kill yourself way too fast.
Now Sacred Fire Flareon would actually be usable, and fulfill a unique niche. Flareon has a good enough special defense stat that it can actually be a good special wall in lower tiers, and with Sacred Fire not only would it have a usable STAB, but it would also put the opponents in a catch-22 of staying in against the wall they can't kill, or switching in a physical attacker on a move that has a 50% chance to burn.