I have a typhlosion on my team right now, but I’m thinking of buying a Delta Litwick from the game corner and evolving it. D. Chandelier has a great fire/fairy typing and a 145 Special Attack, but has bad HP (60) and Speed (80) stats. My current team is composed of Delta Charizard, Delta Gardevoir, Excadrill, Typhlosion, and Feraligatr. I plan to add Delta Bisharp later, and to replace Feraligatr with a stronger water type.
Well though they both have their benefits, i’d probably go with typhlosion. Although it’s movepool is not so great, it’s mega’s ability, which is a special attack moxie, is godly when combined with eruption, which can be relearned (also, you get the mega stone through a trade right before the 4th gym leader). If your willing to level up another cyndaquil with the audino trainer, you could use dexnav to get one with extrasensory. Also, a suggestion for a water type, you could get an azumarill with huge power, it learns aqua tail and play rough before level 30 and still lets you have a fairy type. I would have suggested delta haxorus, but you already have a steel type.