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>swap its special attack and HP
>give flareon sizzly slide (optional)
I see a lot of people say to swap special attack and speed, but that really just makes it Arcanine
>same speed
>more attack
>less HP
with worse coverage
>wild charge
>play rough
>iron head
>raging fury
>psychic fangs
>etc.
Personally, making it a pure fire with decent HP and good special defense with a massive attack stat really fuck with physically frail special attackers, fire has 6 resistances, It's pretty good. Decent HP also makes its wish a lot better and curse is a cool move for a slow bulky Flareon
Sizzly slide is just a wish, really. It would make it annoying for any would be physical sweeper who wants to try and break Flareon to eat a free burn on the switch in. It's also a solid 90 power, so it's gonna hit decently hard.
I don't mention sacred fire because unless game freak want to delve further into the lore of the burned tower and out right state that the three Pokémon that died were the eeveelutions, I don't see a reason for Flareon to ever learn sacred fire since it doesn't fit thematically compared to ho-oh and Entei
