Ifrit (Mi'ihen)

You'll first encounter Belgemine on the Mi’ihen Highroad. This fight isn't mandatory, so you can skip it if you wish.

Since you can't use the same Aeon as Belgemine, you'll be fighting with Valefor. If Valefor's Overdrive gauge is full, now's a great time to use Grand Summon to unleash a powerful Overdrive attack.

Pay attention to the brief tutorial at the start of the battle; it'll introduce you to the Shield and Boost commands. Shield stops your Aeon's Overdrive gauge but significantly reduces incoming damage. Boost speeds up the gauge but increases damage taken. You can experiment with Boost if you like, but the fight largely follows a predictable pattern.

Ifrit will alternate between a standard attack and Meteor Strike, which hits harder. The game suggests using Shield right before Meteor Strike to mitigate the damage.

Since Ifrit is immune to the delay effect of Sonic Wings, it's better to use Blizzard for damage. While Ifrit doesn't seem to have an Ice weakness, it's still more effective than other spells. Crucially, do not use Fire attacks, as Ifrit absorbs them completely.

Keep an eye on your Overdrive gauge. You should be able to build up enough for another Overdrive attack, which can be useful for a final push if needed before the fight concludes.