Suggested Skill set:

Lightning Breath+

Reciprocal Aid / Reposition

Bonfire

Steady Breath / Triangle Adept / Fury / Distant Def

Quick Riposte / Green Tomebreaker

Fortify Dragons / Hone Attack / Hone Speed

IVs: Neutral / +Speed, -HP

Explanation:

Triangle Adept or Fury are required to survive heavily-merged high-speed Julia variants, as well as a heavily-buffed Spring Camilla. Distant Def is also a great skill since it exchange some offensive power for more tankiness against common ranged threats. She is the team's main answer to Green mages, and without either of the two, the possibility of green mages decimating your team becomes exponentially higher (especially a +Speed Life & Death Julia / Hone Fliers Gronnblade+ Spring Camilla). Green Tomebreaker is an alternative to Quick Riposte if Green Mages are the only problems your team faces.

Steady Breath is a hugely beneficial skills for units with innate Distant Counter unit. With other form of cooldown support such as Infantry Pulse or Quickened Pulse (or not), most Dragons become absolute tanking machine with it and can check a lot of prevalent threats (such as CYL Lyn) with their specials.

Other than Green Mages, Young Tiki will have no issue facing Green units, especially with Triangle Adept. Reciprocal Aid can be very effective inside a Triple Dragons core thanks to their above average HP and amazing DEF/RES when they are next to each other. Reposition is always highly-valued as one of the most useful support skills in the game and can be taken if it suits the player's style. Although, there is a lot less pressure to run said skill with Dragons due to their bulk, so feel free to use a Support Skill of your choice. If one prefers to race for the defensive tiles, the movement assists Reposition, Draw Back and Pivot can be used to reach them as quickly as possible.