I'm currently doing a blind playthrough, so I'm translating stuff along the way. If you want to discuss translations sooner or later, I'm up for it.
Last Words
Reimu - [Hakurei Healing Barrier] Same as GoS, heals the entire party.
Marisa - [Master Spark] A piercing type attack, Master Spark. More powerful than normal spells. Damage is boosted as its user levels up.
Youmu - [Eternal Slash] A 6 hit slash attack, dealing around 3x her normal damage overall. Damage is boosted as its user levels up.
Mokou - [Phoenix Resurrection] Revives any dead characters, and casts Reraise on currently living ones.
Okuu - [Mega Flare] Hits all enemies for about the same damage as Master Spark. Damage is boosted as its user levels up.
Nitori - [Perfect Camouflage] Buffs the party with a one time barrier that nulls damage.
Yuuka - [Flowering Defense] Nulls all physical damage for your party for a single turn.
Patchouli - [Philosopher's Stone] Inflicts non elemental damage to the entire enemy party. Damage is boosted as its user levels up.
Sanae - [Yasaka's Divine Wind] Same as GoS, boosts all stats for your entire party.
Sunny Milk - [Fatal Flash] Inflicts Stun at 100% chance to the entire enemy party.
Eiki - [Last Judgement] Inflicts non elemental damage to the entire enemy party. Will not work on certain enemies. Fixed 666 damage.
Yuyuko - [Resurrection Butterfly] Inflicts Instant Death to the entire enemy party. Will not work against resistant enemies.
About Formations
This time, there's a bar discerning each character in a formation. This bar represents the chance that they will be targeted in battle.
Free Fight - Same as in GoS, no special bonuses.
Solitude - The person in the front gets Patk, Pdef, and Speed bonuses, but has a very high chance of being targeted.
All for One - The rear character gains bonuses to Patk and Matk and is less likely to be targeted.
Twin Shield - The characters in the front act as a shield for the rear, with bonuses to Pdef.
Triple Wall - The characters in the front act as a shield for the rear, with bonuses to Pdef.
Crane's Wing Formation - The characters in the front get a bonus to their Patk, while the character in the rear gets a Pdef bonus and is rarely targeted.
Fish's Scale Formation - The characters in the front get a bonus to their Patk and Speed.
Hakurei Type - Slightly different from GoS, the characters in the front get a bonus to Patk, the character in the middle gets a Pdef bonus and acts as bait, but the rear gets a bonus in Speed instead of Matk.
Double Attacker - The characters in front get a bonus to Patk, and the characters in rear get a bonus to Speed.
Crescent - The characters in the front and middle get a bonus to Patk and Speed.
Suprise - The characters in the middle get a bonus to Speed, while the characters in the rear get a bonus to Matk.