Another non-delta Fire-type to use is Typhlosion. If you get the Mega Stone, it becomes even better, and I believe it is the only other Fire-type besides Delta Sunflora and Charizard to have a Mega.
List of Delta Fire-types:
Delta Sunkern/Sunflora
Delta Combee/Vespiquen
Delta Snorunt/Glalie/Froslass (Glalie is fire rock and Froslass is pure fire)
Delta Drifloon/Drifblim
Delta Wooper/Quagsire
Delta Greninja
Delta Chinchou/Lanturn
Delta Remoraid/Octillery
Delta Sableye
Delta Aron/Lairon/Aggron
Delta Plusle
Delta Croagunk/Toxicroak
Delta Venipede/Whirlipede/Scolipede
Delta Petilill/Lilligant (Water-Fire type)
Delta Emolga
Delta Litwick/Lampent/Chandelure
Delta Registeel
I’m using delta Emilia and it’s actually really good. Especially when you can get to Geia town you can get it’s hidden ability whatcha is OP.
pls don’t reply to topics that were last replied to a year ago . Also they said which should they use, and just listing out all the fire type deltas doesn’t rly narrow it down?
My bad I didn’t notice because of the post above
I am in the Post-Game, and i can breed you a fire type you wish. I can get you most of them probably. 
this post was made a year ago, doubt they need it
yeah lmao, didn’t see it