I listed Halloween's Lagurus' bloomed abilities in my last post, but I noticed that the 5* exchange section lets you see the abilties for any unit that has a bloomed form now. Gaillardia isn't on the list but I have her evolved now so I was able to look at her bloomed abilities that way. In any case:
-= Thoroughwort =-
Base ability: During battle, Solar Blast effect increases by 20%.
Evolved ability: Increases party member's ATK by 12%; gives you a 33% chance to attack again when engaging an enemy.
-= Rose =-
Base: Party member ATK increases by 15%; Rose has a 100% chance of converting DEF x3 into ATK and counterattacking.
Evolved: Start battle with Light Gauge 20% full.
-= Kalanchoe =-
Base: During battle, party member ATK rate increases by 10%, Critical rate increases by 10%.
Evolved: In battle, there is a 65% chance of avoiding enemy attacks for 2 turns, decreasing to 40% afterwards.
-= Gaillardia =-
Base: ATK increases for 3 units including herself; Gaillardia gets an 80% chance of counterattacking with DEF x2 converted to ATK.
Evolved: +50 added to party speed.